At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by theta(t)=( 259rad/s )t- 19.5rad/s^2 )t^2-( 1.49rad/s^3 )t^3. 1.At what time is the angular velocity of the motor shaft zero? 2.Calculate the angular acceleration at the instant that the motor shaft has zero angular velocity. 3.How many revolutions does the motor shaft turn through between the time when the current is reversed and the instant when the angular velocity is zero? 4.How fast was the motor shaft rotating at t=0, when the current was reversed? 5.Calculate the average angular velocity for the time period from t=0 to the time calculated in part A.
At times t = 5.84 and t = 12.64, the motor shaft's angular velocity is zero. It accelerates at an angle of -156.4 rad/s². Until the angular velocity is zero, the motor shaft makes around 96.6 revolutions.
Why does the orientation of the AC generator's coil change every half-rotation?Alternating current, often known as a current that continually changes direction (polarity), is produced by an AC generator by the polarity of the current in each arm changing after every half cycle.
theta'(t) = 259 - 39t - 4.47t² = 0
t = (-(-39) ± √((-39)² - 4(259)(-4.47))) / (2(-4.47))
t ≈ 5.84 seconds or t ≈ 12.64 seconds
theta''(t) = -39 - 8.94t
At t ≈ 5.84 seconds, the angular acceleration is:
theta''(5.84) = -39 - 8.94(5.84) ≈ -90.1 rad/s²
At t ≈ 12.64 seconds, the angular acceleration is:
theta''(12.64) = -39 - 8.94(12.64) ≈ -156.4 rad/s²
theta(t) = (259t - 19.5t² - 1.49t³) dt
Integrating between t=0 and t ≈ 5.84 seconds, we get:
theta ≈ 606.6 radians
We divide by 2 to translate to revolutions:
theta ≈ 96.6 revolutions
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Part C Four racecars are driving at constant speeds around a circular racetrack. The daiabie gives the speed of each car and each car's d Speed (m/s) 40 40 50 50 Position (m) 20 25 20 Car Rank the cars' accelerations from largest to smallest. To rank items as equivalent, overlap them Largest Acceleration lu The corect rankig carat be determined. lity Ansuers Qive Up Submit
The cars' accelerations ranked from largest to smallest are, Car 3, Car 1, Car 4, Car 2.
To rank the cars' accelerations from largest to smallest, we first need to calculate their centripetal accelerations. Centripetal acceleration is the acceleration experienced by an object moving in a circular path and is given by the formula:
a = v² / r
where a is the centripetal acceleration, v is the speed of the car, and r is the radius of the circular track. Since the distances given in the table correspond to the positions of the cars on the track, we can assume that the track is a circle with a radius of 5 meters (half the difference between the distances of each car). Using this radius, we can calculate the centripetal acceleration for each car:
Car 1: a = (40 m/s)² / 5 m = 320 m/s²
Car 2: a = (40 m/s)² / 10 m = 160 m/s²
Car 3: a = (50 m/s)² / 5 m = 500 m/s²
Car 4: a = (50 m/s)² / 10 m = 250 m/s²
Therefore, the cars' accelerations ranked from largest to smallest are:
Car 3 (500 m/s²)
Car 1 (320 m/s²)
Car 4 (250 m/s²)
Car 2 (160 m/s²)
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--The complete question is, Part C Four racecars are driving at constant speeds around a circular racetrack. The data table gives the speed of each car and each car's distance at that instant.
Speed (m/s) 40 40 50 50
Position (m) 20 25 20 25
Rank the cars' accelerations from largest to smallest.--
find the minimum magnetic field needed to exert a 5.3 ×10−15 n force on an electron moving at 24 ×106 m/s .
The minimum magnetic field needed to exert a 5.3 × 10^(-15) N force on an electron moving at 24 × 10^6 m/s is approximately 1.37 × 10^(-4) T (teslas).
To find the minimum magnetic field needed to exert a 5.3 × 10^(-15) N force on an electron moving at 24 × 10^6 m/s, you'll need to use the following formula for the magnetic force on a moving charge:
F = q * v * B * sin(θ)
where F is the magnetic force, q is the charge of the electron, v is its velocity, B is the magnetic field, and θ is the angle between the velocity and the magnetic field.
The charge of an electron (q) is -1.6 × 10^(-19) C. Since we want to find the minimum magnetic field (B), the angle θ should be 90°, making sin(θ) equal to 1.
Rearrange the formula to solve for B:
B = F / (q * v * sin(θ))
Now, plug in the values:
B = (5.3 × 10^(-15) N) / ((-1.6 × 10^(-19) C) * (24 × 10^6 m/s) * (1))
B ≈ 1.37 × 10^(-4) T
Approximately 1.37 × 10^(-4) T (teslas) of magnetic field is required to apply a 5.3 × 10^(-15) N force to an electron travelling at 24 × 10^6 m/s.
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A 61.5 m length of insulated copper wire is wound to form a solenoid of radius 1.9 cm. The copper wire has a radius of 0.53 mm_. (Assume the resistivity of copper is rho = 1.7 x 10^-8 Ω-m.rho =.) If the solenoid is attached to a battery with an emf of 6.0 V and an internal resistance of 350 m-Ω350 m-Ω, compute the time constant of the circuit.
A battery has an internal resistance if 0.4 ohm and an e.m.f. of 6 volts. It really is connected to an SPST (single pole, single throw) switch, which is connected to the a 2.6 ohm resistor.
Which expressions result in the battery's emf and the resistor's current?Answer. The formula for a battery's emf is V + I r, where V denotes the battery's terminal voltage, r denotes the battery's internal resistance, and I is the current flowing through the circuit.
What is the formula for EMF current and voltage?The electromotive force (EMF) formula can be written as e = IR + Ir or e = V + Ir, where e is just the electromotive force (in volts), I is the current (in amps), R is the load resistance, and r is the reactance of the cell, measured in ohms.
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Free response From Mr Wignall (13 pts). A massless pan is attached to the top of a massless om spring. A piece of clay of mass m is dropped from a height h onto the pan. piece of clay strikes the pan and sticks to it. Assume direction down to be positive. h a. What is the speed of the clay just before it hits the pan? (2 pts)
The speed of the clay just before it hits the pan can be calculated using the conservation of energy principle.
According to the conservation of energy principle, the total energy of the system remains constant. Initially, the clay has only potential energy due to its height, which is given by mgh, where m is the mass of the clay, g is the acceleration due to gravity, and h is the height from which the clay is dropped.
When the clay hits the pan, it comes to rest, and its potential energy is converted into the potential energy of the spring. If the spring has a spring constant k, then the potential energy stored in the spring is given by (1/2)kx^2, where x is the displacement of the spring from its equilibrium position.
Since the pan and spring are massless, the total energy of the system before and after the collision is the same. Therefore, we can equate the potential energy of the clay to the potential energy of the spring, and solve for the speed of the clay just before it hits the pan:
mgh = (1/2)kx^2
x = (mgh/k)^0.5
The displacement of the spring is equal to the distance that the clay compresses the spring. This distance is also equal to the maximum height that the clay rises after the collision, which is given by h' = x + (m/k)g.
Therefore, the total distance traveled by the clay after the collision is h + h', and the time taken to travel this distance is given by t = (2(h+h')/g)^0.5.
Finally, the speed of the clay just before it hits the pan can be calculated using the formula v = gt:
v = g(2(h + x + (m/k)g))^0.5
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In a ballistic pendulum an object of mass m is fired with an initial speed v0 at a pendulum bob. The bob has a mass M, which is suspended by a rod of length L and negligible mass. After the collision, the pendulum and object stick together and swing to a maximum angular displacement θ as shownu=0 て 7
1.Find an expression for v0, the initial speed of the fired object.
Express your answer in terms of some or all of the variables m, M, L, and θ and the acceleration due to gravity, g.
2.An experiment is done to compare the initial speed of projectiles fired from high-performance catapults. The catapults are placed very close to a pendulum bob of mass 10.0 kg attached to a massless rod of length L. Assume that catapult 1 fires a projectile of mass 5.50 g at speed v1 and catapult 2 fires a projectile of mass 8.00 g at speed v2. If the projectile from catapult 1 causes the pendulum to swing to a maximum angular displacement of 7.20 ∘ and the projectile from catapult 2 causes a displacement of 12.0 ∘, find the ratio of the initial speeds, v1/v2 .
The ratio of initial speed of pendulum [tex]\frac{v_{1} }{v_{2} }[/tex] is [tex]\frac{M+m}{m} \sqrt{2gL(1-cos}[/tex] with mass m is fired with an initial speed v0 at a pendulum bob.
SpeedConservation of Momentum can be used to determine the first half:
[tex]mv_{o} =(M+m)v[/tex]
Calculate the initial speed first, then apply the principle of conservation of energy to determine the height the pendulum will reach. The final speed of the two objects after they come together is related to the kinetic energy for the "initial" in the Conservation of Energy equation by the relationship that we just established:
[tex]\frac{1}{2}(M+m)v=(M+m)gh[/tex]
The height of the pendulum in terms of L and Фmust be calculated because the mass cancels on both sides, which may be done using trig:
Think of the pendulum's starting point and ending point as the two sides of a right triangle, with an angle in between. The triangle is rotatable By tracing the pendulum's final movement back to where the string was initially placed, a right triangle is formed. As a result, we are able to determine that the pendulum's vertical displacement is equal to h and that the vertical leg's length is L-h(cos Ф). Therefore:
since[tex]cosФ=\frac{L-h}{L}[/tex]
In order to understand that, we may change this to [tex]\frac{1}{2}(M+m)v=(M+m)gh[/tex] to see that [tex]\frac{1}{2}v_{0} =gL(1-cos Ф)[/tex]
Once the velocity has been determined, simply substitute it into the Conservation of Momentum formula:
[tex]\frac{M+m}{m} \sqrt{2gL(1-cos}[/tex]
Put the values into the equation above in SI units to solve the second portion.
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For the gauge that reads absolute pressure in the tank, does the pressure reading decrease, increase, or remain the same? O The pressure reading decreases. O The pressure reading increases. O The pressure reading remains the same. O More information is needed to answer.
The gauge that reads absolute pressure in the tank will show a constant pressure reading, as it measures the pressure relative to a complete vacuum (i.e. absolute zero pressure).
A gauge is a device used for measuring or displaying various physical quantities, such as pressure, temperature, or fluid flow rate. Gauges can be analog or digital and come in a variety of forms, depending on the specific application and measurement being made.
One common type of gauge is a pressure gauge, which is used to measure the pressure of a fluid or gas in a container or system. Pressure gauges typically consist of a gauge face, which displays the pressure reading, and a needle or pointer that moves in response to changes in pressure. The gauge face may be calibrated in units such as pounds per square inch (psi) or kilopascals (kPa), depending on the desired units of measurement.
The gauge that reads absolute pressure in the tank will show a constant pressure reading, as it measures the pressure relative to a complete vacuum (i.e. absolute zero pressure). Therefore, changes in atmospheric pressure will not affect the reading. So, the pressure reading remains the same.
Therefore, the pressure reading on the gauge will remain the same, regardless of whether the tank is upright or lying on its side, as long as the pressure inside the tank remains constant.
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2. at what frequency is the reactance of a 350.0-µh inductor equal to 120 ω?
The reactance of a 350.0-µh inductor equal to 120 ω in frequency is 1.03MHz
The reactance of an inductor is given by the formula Xl = 2πfL, where Xl is the inductive reactance, f is the frequency in hertz, and L is the inductance in henries.
Frequency is a number that describes how often a particular item appears in the given data set. In physics, frequency is a number that describes how frequently a particular item appears in the given data set. There are two types of frequency distributions: grouped and ungrouped. The two different kinds of frequency tables are distribution.
To find the frequency at which the reactance of a 350.0-µh inductor is equal to 120 ω, we can rearrange the formula as follows:
f = Xl / (2πL)
Substituting the given values, we get:
f = 120 Ω / (2π x 350.0 x 10^-6 H)
f ≈ 1.03 MHz
Therefore, the frequency at which the reactance of a 350.0-µh inductor is equal to 120 ω is approximately 1.03 MHz.
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An L-R-C series circuit has L = 0.400 H, C = 4.00 μF, and R = 370 Ω. At t = 0 the current is zero and the initial charge on the capacitor is 2.80 × 10−4 C.
Part A
What is the values of the constant A in the followin equetion?
q=Ae−(R/2L)tcos(1LC−R24L2−−−−−−−−√t+ϕ)
The value of the constant A in the given equation is 2.97 × 10⁻⁴ C.
To find the value of A, we need to use the initial conditions given in the problem. At t=0, the current is zero and the initial charge on the capacitor is 2.80 × 10⁻⁴ C.
Using the equation for charge in an L-R-C series circuit, we can write:
q = q(max) * sin(ωt + ϕ)
where q(max) is the maximum charge on the capacitor, ω is the angular frequency, and ϕ is the phase angle.
We can find the values of ω and ϕ using the given values of L, C, and R:
ω = 1 / √(LC) = 5000 rad/s
ϕ = arctan((1/RC) - (ωL/R)) = 1.392 rad
Now we can rewrite the equation for charge in terms of the given equation:
q = Ae^(-R/2L)t * cos(√(1/LC - R²/4L²)t + ϕ)
At t=0, we know that q=2.80 × 10⁻⁴ C. Plugging this in and solving for A, we get:
2.80 × 10⁻⁴ = A * cos(ϕ)
A = 2.80 × 10⁻⁴ / cos(ϕ)
A = 2.80 × 10⁻⁴ / cos(1.392)
A = 2.97 × 10⁻⁴ C
Therefore, the value of the constant A in the given equation is 2.97 × 10⁻⁴ C.
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specific gravity number is same as density number of matters. the unit of specific gravity is …?………
The unit of Specific Gravity is dimensionless.
The statement explains that specific gravity is a dimensionless unit, which means that it has no unit associated with it. Specific gravity is used to compare the density of a substance to the density of a reference substance, usually water. It is a ratio of the two densities and is expressed as a number without any unit. Although density and specific gravity are related, they are not the same thing. Density is typically measured in units such as kg/m³ or g/cm³, while specific gravity is a unitless number that compares the densities of two substances.
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the angular velocity of a rotating turntable is given in rad/s by ω(t) = 4.5 0.64t - 2.7t2. what is its angular acceleration at t = 2.0 s?
The angular acceleration of the rotating turntable at t = 2.0 s is -10.16 rad/s².
To find the angular acceleration of the rotating turntable at t = 2.0 s, we need to first find the derivative of the given angular velocity function ω(t) = 4.5 + 0.64t - 2.7t².
Step 1: Differentiate the angular velocity function with respect to time t.
dω/dt = 0 + 0.64 - 5.4t
Step 2: Substitute t = 2.0 s into the derivative to find the angular acceleration.
α(t) = 0.64 - 5.4(2.0)
α(t) = 0.64 - 10.8
α(t) = -10.16 rad/s²
The angular acceleration of the rotating turntable at t = 2.0 s is -10.16 rad/s².
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Consider an inverter with its input voltage V,- 0. Why would the inverter dissipate power even in this case?
The inverter dissipates power even with its input voltage V,- 0 because of the following reasons:
1)Switching losses
2)Standby losses
3)Leakage currents.
An inverter is an electronic device that converts DC (direct current) power to AC (alternating current) power. In an inverter, a voltage source, typically a battery or a DC power supply, is connected to the input of the inverter. The input voltage is then converted into an AC output voltage by means of electronic switches such as transistors or thyristors.
Even when the input voltage of an inverter is zero, the inverter may still dissipate power due to various reasons such as:
1) Switching losses: The electronic switches used in the inverter have finite switching times and during this time, they may not be fully conducting or fully non-conducting. This results in a short-circuit condition across the input voltage source, which causes current to flow and power to be dissipated.
2) Standby losses: Inverters may have standby circuits that draw a small amount of power even when there is no load connected to the output. This power is dissipated in the inverter circuitry and may be used to power the control circuitry or for other purposes.
3) Leakage currents: The electronic components used in the inverter circuitry have finite resistance and capacitance values, which can result in leakage currents that flow even when there is no input voltage present. These leakage currents can cause power to be dissipated in the inverter circuitry.
Therefore, even when the input voltage of an inverter is zero, the inverter may still dissipate power due to the reasons mentioned above. The amount of power dissipated will depend on the specific design of the inverter and the conditions under which it is operating.
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A 3.5cm radius hemisphere contains a total charge of6.6*10-7 C. the flux through the rounded portion of thesurface is 9.8*104 Nm2/C. The flux throughthe flat base is: a. 0 b. +2.3*104 Nm2/C c. -2.3*104 Nm2/C d. +9.8*104 Nm2/C e. -9.8*104 Nm2/C
The negative sign indicates that the electric field is directed inward toward the center of the hemisphere.
What is a 3.5cm radius hemisphere contains?We can use Gauss's law to solve this problem, which states that the electric flux through a closed surface is equal to the total charge enclosed by the surface divided by the electric constant, ε0.
In this case, we are given the radius of the hemisphere, r= 3.5 cm, and the total charge enclosed by the surface, Q = 6.6 x 10^-7 C. We are also given the flux through the rounded portion of the surface, Φ = 9.8 x 10^4 Nm^2/C.
To find the flux through the flat base, we can use the fact that the flux through the entire closed surface must be equal to the sum of the fluxes through each part of the surface. Since we know the flux through the rounded portion of the surface, we can subtract that from the total flux to find the flux through the flat base:
Φ_total = Φ_rounded + Φ_flat
Φ_flat = Φ_total - Φ_rounded
The flux through the entire closed surface is given by the surface area of the hemisphere, which is:
A_total = 2πr²
A_total = 2π(0.035 m)²
A_total = 0.0077 m²
The flux through the entire surface is:
Φ_total = Q/ε0 = (6.6 x 10⁻⁷ C) / (8.85 x 10⁻¹² N^-1m⁻²C²)
Φ_total = 7.44 x 10⁴ Nm²/C
Now we can find the flux through the flat base:
Φ_flat = Φ_total - Φ_rounded
Φ_flat = (7.44 x 10⁴ [tex](Nm^2/C)[/tex]) - (9.8 x 10⁴ [tex]Nm^2/C[/tex])
Φ_flat = -2.36 x 10⁴ [tex]Nm^2/C[/tex]
Therefore, the answer is (c) -2.3 x 10⁴ [tex]Nm^2/C.[/tex]
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a 1000 kg car traveling at a speed of 40 m/s skids to a haha on rawl concrete where f-x = 0.60. how long are the skid marks?
The automobile stops and moves in the opposite direction of its starting velocity, as indicated by the negative sign. The length of the car's skid marks is around 136.05 metres.
Calculation-
the equation of motion
[tex]v^2 = u^2 + 2a s[/tex]
Given:
Mass of the car (m) = 1000 kg
Initial velocity (u) = 40 m/s
Final velocity (v) = 0 m/s
Coefficient of friction (f) = 0.60
The friction force (F) acting on the car
[tex]F = f * m * g[/tex]
the acceleration due to gravity (9.8 m/s^2).
Plugging in the values:
[tex]f = 0.60m = 1000 kgg = 9.8 m/s^2F = 0.60 * 1000 kg * 9.8 m/s^2F = 5880 N[/tex]
The acceleration (a) of the car
[tex]F = m * aPlugging in the values:F = 5880 Nm = 1000 kg5880 N = 1000 kg * aa = 5880 N / 1000 kga = 5.88 m/s^2[/tex]
the equation of motion to calculate the distance (s)
[tex]v^2 = u^2 + 2a s0 = (40 m/s)^2 + 2 * 5.88 m/s^2 * s0 = 1600 m^2/s^2 + 11.76 m/s^2 * s11.76 m/s^2 * s = -1600 m^2/s^2s = (-1600 m^2/s^2) / (11.76 m/s^2)s = -136.05 m[/tex]
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A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
a. increase
b. decrease
c. remain unaffected
d. have its shae changed
The volume and shape of the spherical cavity inside the solid metal ball will remain the same when the ball is heated. The correct option is c. remain unaffected.
When a solid ball of metal is heated, it expands due to the increase in temperature. However, the spherical cavity inside the ball does not expand as it is already a fixed size. This means that the space occupied by the cavity remains the same, while the metal ball around it expands.
As a result, the volume of the cavity inside the metal ball remains unaffected when the ball is heated. The shape of the cavity will also remain the same as it is a fixed shape that cannot change due to temperature changes.
It is important to note that the type of metal the ball is made of will affect how much it expands when heated. Some metals have a higher coefficient of thermal expansion, meaning they will expand more than others when heated. However, this expansion will only affect the outer surface of the metal ball and not the cavity inside it.
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Does hydrogen bonding occur in a pure sample of dimethyl ether? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help in the same molecule Hydrogen bonding in a pure sample of dimethyl ether. A hydrogen bond is interaction between a hydrogen atom bonded to and an electron-rich occurs does not occur region elsewhere an attractive In the same molecule or in a different molecule in a different molecule a low electronegative atom (like C, B, P) a repulsive a very electronegative atom (O, N. or F)
Hydrogen bonding does not occur in a pure sample of dimethyl ether.
A hydrogen bond is an interaction between a hydrogen atom bonded to an electron-rich region elsewhere in the same molecule or in a different molecule with a very electronegative atom (like O, N, or F), resulting in an attractive force. However, dimethyl ether contains only C and H atoms, which have low electronegativities and cannot participate in hydrogen bonding, resulting in a repulsive force. In dimethyl ether, hydrogen is bonded to a low electronegative atom (like C), which does not allow for hydrogen bonding to take place.
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If 5.0 x 10^21 electrons pass through a 20-Ω resistor in 10 min, what is the potential difference across the resistor?
a. 21 V
b. 32 V
c. 27 V
d. 37 V
e. 54 V
The correct option is C, The potential difference across the resistor is 26.6 V, which is closest to 27 V.
We know that [tex]5.0 \times 10^{21[/tex]electrons pass through the resistor in 10 minutes, so we need to find the current in units of amperes (A):
1 electron has a charge of [tex]1.6 \times 10^{-19} C[/tex]
The resistor's rate of electrons travelling through it per second is [tex](5.0 \times 10^{21}) / (10 \times 60) = 8.33 \times 10^{16[/tex] electrons/s
The current is therefore
[tex]I = (8.33 \times 10^{16} electrons/s) \times (1.6 \times 10^{-19} C/electron)[/tex] = 1.33 A
Now we can use Ohm's law to find the potential difference across the resistor:
V = IR = (1.33 A) x (20 Ω) = 26.6 V
A resistor is designed to have a specific resistance value, which is measured in ohms. Resistors are used in a wide range of electrical and electronic applications to control the amount of current flowing through a circuit, to limit voltage, and to divide voltage.
A resistor is made of a material that has a high resistance to the flow of electric current, such as carbon or metal. The resistance of a resistor is determined by its physical dimensions, material, and temperature. Resistors come in various shapes and sizes, including cylindrical, rectangular, and surface-mount types. Resistors are often color-coded to indicate their resistance value, tolerance, and other specifications. They can be connected in series or parallel in a circuit to achieve specific voltage and current requirements.
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what is the terminal voltage (in v) of a large 1.05 v carbon-zinc dry cell used in a physics lab to supply 1.50 a to a circuit, if the cell's internal resistance is 0.150 ω?
The terminal voltage of the large 1.05 V carbon-zinc dry cell is 0.825 V when supplying 1.50 A to a circuit with an internal resistance of 0.150 Ω.
To calculate the terminal voltage of the carbon-zinc dry cell, we can use Ohm's Law which states that V = I*R, where V is the voltage, I is the current, and R is the resistance.
In this case, the current is given as 1.50 A and the internal resistance is 0.150 Ω. So,
V = I*R
V = 1.50 A * 0.150 Ω
V = 0.225 V
However, this is the voltage drop across the internal resistance of the cell. To find the terminal voltage, we need to subtract this voltage drop from the initial voltage of the cell, which is 1.05 V.
Terminal voltage = Initial voltage - Voltage drop
Terminal voltage = 1.05 V - 0.225 V
Terminal voltage = 0.825 V
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What is the kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s (90.0 mph)?
a. 54.0 J
b. 87.0 J
c. 108 J
d. 216 J
The kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s (90.0 mph) is c. 108 J.
To find the kinetic energy of the baseball, you can use the following formula:
Kinetic energy (KE) = 0.5 × mass × velocity²
In this case, the mass of the baseball is 0.135 kg, and the velocity is 40.0 m/s. Plug these values into the formula:
KE = 0.5 × 0.135 kg × (40.0 m/s)²
Now, calculate the kinetic energy:
KE = 0.5 × 0.135 kg × 1600 m²/s²
KE = 0.0675 × 1600
KE = 108 J
So, the correct answer is c. 108 J.
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A truck is pulling a car. . is the magnitude of the force that the truck exerts on the car ·FC is the magnitude of the force that the car exerts on the truck onsider the following scenarios independently he truck is coasting along with a constant velocity on a horizontal surface, neglecting friction Submit Answer Tries 0/2 he truck is speeding up while driving up a mountain, neglecting friction FTF ㄒㄧ Submit Answer Tries 0/2 he truck is driving with a constant velocity, but as it turns out, the driver of the car left the emergency brake on
Newton's third law states equal magnitudes of forces between truck and car but the direction varies. Zero when coasting, the same as a truck when accelerating, and the opposite when a car has resistance.
In all three scenarios, the magnitude of the force that the truck exerts on the car (FTC) is equal to the magnitude of the force that the car exerts on the truck (FC) according to Newton's third law of motion. However, the direction of the force may vary depending on the situation.
In the first scenario, where the truck is coasting along with a constant velocity on a horizontal surface neglecting friction, the force of the truck pulling the car is equal to the force of the car pulling back on the truck, which is equal to zero since there is no acceleration or resistance.
In the second scenario, where the truck is speeding up while driving up a mountain neglecting friction, the force of the truck pulling the car is greater than the force of the car pulling back on the truck since the truck is accelerating. Therefore, the direction of the force is in the same direction as the truck's motion up the mountain.
In the third scenario, where the truck is driving with a constant velocity, but the driver of the car left the emergency brake on, the force of the truck pulling the car is equal to the force of the car pulling back on the truck, which is greater than zero due to the resistance caused by the emergency brake. Therefore, the direction of the force is opposite to the direction of the truck's motion.
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Which fuel source is considered the most polluted when burned?
Answer:The burning of fossil fuels, such as coal, oil, and natural gas, is generally considered to be the most polluting source of energy.
Explanation:
Explanation:
Burning coal is often considered one of the more polluting fuels (when scrubbers are not in use) , but burning wood ( or 'biomass') is even worse.
The position of a particle moving along a coordinate plane is s = StartRoot 1 + 5 t EndRoot, with s in meters and t in seconds. What is the particle’s velocity when t = 3 sec?
a. 1/8 m/s
b. 2 m/s
c. 5/8 m/s
d. 4 m/s
c. The velocity of the particle when t = 3 sec is 5/8 m/s.
To find the velocity of the particle, we need to take the derivative of the position function with respect to time (t):
s(t) = sqrt(1 + 5t)
v(t) = ds/dt = (1/2)(1 + 5t)^(-1/2) * 5
At t = 3 sec, we have:
v(3) = (1/2)(1 + 5(3))^(-1/2) * 5
v(3) = (1/2)(16)^(-1/2) * 5
v(3) = 5/8 m/s
Therefore, the answer is c. 5/8 m/s.
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(5) For water, n = 1.333. A fish is 80 cm below the surface of a pond. How far below the surface of the water does the fish appear to be (in cm), to an observer outside the water and almost directly above the fish?
To an observer outside the water having a refractive index of 1.33, and almost directly above the fish, the fish appears to be at a depth of 60 cm below the surface of the water.
The apparent depth of an object in water is given by the formula:
apparent depth = real depth / refractive index
where the refractive index of water is n = 1.333.
In this case, the real depth of the fish is 80 cm. So the apparent depth of the fish is:
apparent depth = 80 cm / 1.333
apparent depth = 60 cm
Therefore, the fish appears to be 60 cm below the surface of the water to an observer outside the water and almost directly above the fish.
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a 10.5 v battery is connected to a 5.2 pf parallel-plate capacitor. what is the magnitude of the charge on each plate? answer in units of c
The magnitude of the charge on each plate is 54.6 × 10⁻¹² C when a 5.2 pf parallel plate capacitor is connected to a 10.5 v battery.
To find the magnitude of the charge on each plate of a parallel-plate capacitor, you can use the formula:
Q = C × V
where Q is the charge on each plate, C is the capacitance of the capacitor, and V is the voltage across the capacitor.
Given the values in the question:
V = 10.5 V (voltage)
C = 5.2 pF (capacitance, in picofarads)
First, we need to convert the capacitance from picofarads (pF) to farads (F):
1 pF = 1 × 10⁻¹² F
So, C = 5.2 × 10⁻¹² F
Now, we can use the formula to find the charge:
Q = C × V
Q = (5.2 × 10⁻¹² F) × (10.5 V)
Q = 54.6 × 10⁻¹² C
The magnitude of the charge on each plate is 54.6 pC (pico coulombs) or 54.6 × 10⁻¹² C.
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An 18,000 Btu/h split air conditioner is running at full load to keep a room at 25°C in an environment at 45°C. The power input to the air conditioner compressor is 2.5 kw. Determine the COP of the air conditioning unit and the rate at which heat is rejected to the ambient from the air conditioner condenser. [1 Btu = 1,055 kJJ.
COP of the air conditioning unit is 7.596, and the rate at which heat is rejected to the ambient from the air conditioner condenser is 21.49 kW.
To determine the Coefficient of Performance (COP) of the 18,000 Btu/h split air conditioner and the rate at which heat is rejected to the ambient from the air conditioner condenser, follow these steps:
1. Convert the air conditioner capacity from Btu/h to kW:
18,000 Btu/h * (1,055 kJ / 1 Btu) * (1 kW / 1,000 kJ) = 18,990 W = 18.99 kW
2. Calculate the COP:
COP = Cooling Capacity (kW) / Power Input (kW)
COP = 18.99 kW / 2.5 kW = 7.596
3. Calculate the heat rejected to the ambient:
Heat Rejected = Cooling Capacity + Power Input
Heat Rejected = 18.99 kW + 2.5 kW = 21.49 kW
So, the COP of the air conditioning unit is 7.596, and the rate at which heat is rejected to the ambient from the air conditioner condenser is 21.49 kW.
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Two organ pipes, open at one end but closed at the other, are each 1.02m long. One is now lengthened by 2.60cm. Find the frequency of the beat they produce when playing together in their fundamental.
The beat frequency produced when the two organ pipes play together in their fundamental is 1.676 Hz.
When one of the organ pipes is lengthened by 2.60cm, its new length becomes 1.024m (1.02m + 0.026m). The fundamental frequency of an organ pipe that is open at one end and closed at the other is given by the formula:
f = (n/2L) * v
where f is the frequency, n is the harmonic number (1 for the fundamental), L is the length of the pipe, and v is the speed of sound.
For both pipes, the length L is 1.02m. Therefore, the fundamental frequency of each pipe is:
f1 = (1/2*1.02) * v
f2 = (1/2*1.024) * v
When the two pipes play together, they produce a beat frequency equal to the difference between their frequencies. Therefore, the beat frequency is:
fbeat = |f1 - f2| = |(1/2*1.02) - (1/2*1.024)| * v
Simplifying the expression, we get:
fbeat = (0.002/2.04) * v
Substituting the value of the speed of sound (343 m/s), we get:
fbeat = 1.676 Hz
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The beat frequency produced when the two organ pipes play together in their fundamental is 1.676 Hz.
When one of the organ pipes is lengthened by 2.60cm, its new length becomes 1.024m (1.02m + 0.026m). The fundamental frequency of an organ pipe that is open at one end and closed at the other is given by the formula:
f = (n/2L) * v
where f is the frequency, n is the harmonic number (1 for the fundamental), L is the length of the pipe, and v is the speed of sound.
For both pipes, the length L is 1.02m. Therefore, the fundamental frequency of each pipe is:
f1 = (1/2*1.02) * v
f2 = (1/2*1.024) * v
When the two pipes play together, they produce a beat frequency equal to the difference between their frequencies. Therefore, the beat frequency is:
fbeat = |f1 - f2| = |(1/2*1.02) - (1/2*1.024)| * v
Simplifying the expression, we get:
fbeat = (0.002/2.04) * v
Substituting the value of the speed of sound (343 m/s), we get:
fbeat = 1.676 Hz
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The specific heat capacity of water is 4.18 J/g° C. Which description is TRUE?
The specific heat capacity of water is the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius, and it is equal to 4.18 Joules per gram per degree Celsius. This property of water is important in many fields, including chemistry, physics, and engineering.
Specific heat capacity refers to the amount of heat energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius. In the case of water, it takes 4.18 Joules of heat energy to increase the temperature of 1 gram of water by 1 degree Celsius. This property helps water maintain stable temperatures and makes it a good substance for transferring heat.
The specific heat capacity of water is 4.18 J/g °C. This statement is TRUE.
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On May 15, 2000 the term structure of interest rates (continuously compounded) is as shown in the following table. Maturity T 0.5 1 1.5 2 2.5 r(0,T) 6.52% 6.71% 6.79% 6.72% 6.79% Compute the discount factors Z(0,T), the forward discount factors F(0,T-A,T), and the forward rates f(0,T – A,T), where A = 0.5.
Therefore, interest rates and the discount factors are 0.9751, 0.9348, 0.8964, 0.8579, and 0.8197; the forward discount factors are 0.9557, 0.9605, 0.9543, and 0.9537; and the forward rates are -0.0456, 0.0246, -0.0556, and -0.0135.
The discount factors, we use the formula:
Z(0,T) = [tex]e^{(-r(0,T)*T)}[/tex]
where r(0,T) is the interest rate at time 0 for maturity T.
Using the given values, we get:
Z(0,0.5) = [tex]e^{(-0.06520.5)}[/tex] = 0.9751
Z(0,1) = [tex]e^{(-0.06711)[/tex]= 0.9348
Z(0,1.5) = [tex]e^{(-0.06791.5)[/tex]= 0.8964
Z(0,2) = [tex]e^{(-0.06722)[/tex] = 0.8579
Z(0,2.5) = [tex]e^{(-0.0679*2.5)[/tex] = 0.8197
To calculate the forward discount factors, we use the formula:
F(0,T-A,T) = Z(0,T)/(Z(0,T-A))
Using the calculated discount factors, we get:
F(0,0.5,1) = Z(0,1)/(Z(0,0.5)) = 0.9557
F(0,1,1.5) = Z(0,1.5)/(Z(0,1)) = 0.9605
F(0,1.5,2) = Z(0,2)/(Z(0,1.5)) = 0.9543
F(0,2,2.5) = Z(0,2.5)/(Z(0,2)) = 0.9537
To calculate the forward rates, we use the formula:
f(0,T-A,T) = ln(F(0,T-A,T))/A
Using the calculated forward discount factors, we get:
f(0,0.5,1) = ln(F(0,0.5,1))/0.5 = -0.0456
f(0,1,1.5) = ln(F(0,1,1.5))/0.5 = 0.0246
f(0,1.5,2) = ln(F(0,1.5,2))/0.5 = -0.0556
f(0,2,2.5) = ln(F(0,2,2.5))/0.5 = -0.0135
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will indium display the photoelectric effect with uv light? with infrared light?
Since UV light has greater energy photons than infrared light, indium is expected to exhibit the photoelectric effect with UV light but not with infrared light.
Will indium exhibit the photoelectric effect when exposed to infrared or ultraviolet light?If indium is exposed to UV light, the photoelectric effect will manifest. When exposed to infrared light, it won't exhibit the photoelectric effect.
Which metal only emits electrons from its surface when exposed to UV light?Certain metals, including zinc, cadmium, magnesium, etc., were found to only emit electrons from their surfaces when exposed to ultraviolet light with a short wavelength. Lithium, sodium, potassium, caesium, and rubidium are examples of alkali metals that can be sensitive to visible light.
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You need to raise the temperature of a gas by 10°C. To use the least amount of heat energy, should you heat the gas at constant pressure or at constant volume? Reset 0 constant pressure You should use heating at because the required amount of heat is constant volume proportional to volume proportional to pressure inverse proportional to molar specific heat proportional to molar specific heat
Heating the gas at constant volume allows for the most efficient transfer of heat energy to raise the temperature of the gas by a given amount, such as 10°C, and would require the least amount of heat energy.
You should heat the gas at a constant volume in order to use the least amount of heat energy to raise the temperature by 10°C.
When heat is added to a gas at constant volume, the entire amount of energy is used to increase the temperature of the gas. This is because at constant volume, no work is done by the gas to expand against external pressure, and all the heat energy goes towards increasing the internal energy of the gas, which results in a higher temperature.
On the other hand, when heat is added to a gas at constant pressure, some of the energy is used to do work against the external pressure as the gas expands. This means that less energy is available to increase the internal energy of the gas and raise its temperature by the same amount compared to heating at constant volume.
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