This parallel circuit has two resistors at 15 and 40 ohms. What is the total resistance?
a. 55 ohms
b. 25 ohms
c. 60 ohms
d. 35 ohms

Answer:

filament bulb, filament lamp

Explanation:

More length of a wire is a component that has a greater resistance as the current through it increases​.

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions present in the wire as they pass through. The moving electrons can collide with the ions present in the metal.

This makes more difficult for the current to flow and causes resistance in the wire so we can conclude that more length of a wire is a component that has greater resistance as more current passes through it.

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The graph that correctly gives the variation of the electric field as a function of r is the third graph.

The electric field inside a conducting shell is zero. This is because the charges on the shell distribute themselves so that the electric field is zero everywhere inside the shell.

The electric field outside a conducting shell is radial and directed away from the center of the shell. The magnitude of the electric field is inversely proportional to the square of the distance from the center of the shell.

Therefore, the graph of the electric field as a function of r is a horizontal line at zero for r < a, a vertical line at r = a, and a decreasing curve for r > a.

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The magnitude of the electric field just above the middle of the sheet is approximately 3.05 x 10⁶ N/C.

To find the electric field just above the middle of a large, flat, horizontal sheet of charge, we can use Gauss's law.

Gauss's law states that the electric field (E) due to a flat sheet of charge is directly proportional to the charge density (σ) and perpendicular to the sheet.

The charge density is given as 5.40 µC/m², which represents the charge per unit area of the sheet.

The electric field just above the middle of the sheet is the same as the electric field just below the sheet. This is because the sheet is infinitely large and uniformly charged, creating a symmetric electric field.

The formula to calculate the electric field just above the middle of the sheet is:

E = σ / (2ε₀)

Where σ is the charge density and ε₀ is the permittivity of free space, which is approximately 8.85 x 10⁻¹² C²/(N·m²).

Substituting the given values, we have:

E = (5.40 x 10⁻⁶ C/m²) / (2 x 8.85 x 10⁻¹² C²/(N·m²))

Simplifying, we get:

E = 3.05 x 10⁶ N/C

The direction of the electric field is perpendicular to the sheet and points away from it.

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A 600-w TV receiver is turned on for 4 hours with nobody watching it. If electricity costs 10 cents/kWh, the amount of money wasted is cents. Therefore, the amount of money wasted in this case is 24 cents.

There are different steps to calculate the money wasted in this case. Here is the step-by-step solution to this problem:

First, we need to calculate the energy consumed in kWh:

Energy consumed = Power × Time Power = 600 W Time = 4 hours

Energy consumed = Power × Time Energy consumed = 600 W × 4 hours

Energy consumed = 2400 Wh.

To convert Wh into kWh, we need to divide the energy consumed by 1000:

Energy consumed = 2400 Wh = 2.4 kWh.

Now, we can calculate the amount of money wasted:

Cost of 1 kWh = 10 cents Cost of 2.4 kWh = 2.4 kWh × 10 cents/kWh

Cost of 2.4 kWh = 24 cents.  

A 600-w TV receiver is turned on for 4 hours with nobody watching it. If electricity costs 10 cents/kWh, the amount of money wasted is cents. The energy consumed by the TV receiver can be calculated by multiplying the power rating by the time it is used. In this case, the power rating is 600 W, and the time is 4 hours.

Therefore, the energy consumed is 600 W × 4 hours = 2400 Wh.

To convert the energy consumed into kWh, we need to divide it by 1000. So, 2400 Wh = 2.4 kWh. The cost of electricity is 10 cents per kWh.

Therefore, the cost of 2.4 kWh is 2.4 kWh × 10 cents/kWh = 24 cents.

This is the amount of money wasted by keeping the TV receiver turned on for 4 hours without anyone watching it. It is important to turn off electrical appliances when they are not in use to save electricity and reduce the electricity bill.

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Answer:

8 g/cm³

Explanation:

density=mass/volume

volume=2*2*2=8 cm³

mass=64 g

density=64/8=8 g/cm³

The density of a 2 cm x 2 cm x 2 cm cube with a mass of 64 g is equal to 8 g/cm³.

Density can be defined as the material mass per unit of volume. The symbol commonly used to represent density ρ and the letter 'D' can also be used.

The mathematical equation of the density can be represented as written below:

Density = Mass /Volume

or,   ρ = m/V

The density of a material varies with pressure and temperature. There is a small variation for solids and liquids of any material but much larger for gases. Increasing the pressure of material decreases the volume and thus increases its density.

Given the volume of the cube =  2 cm x 2 cm x 2 cm

V = 8 cm³

The mass of the cube, m = 64 g

The density of the cube can be calculated from the above-mentioned formula:

Density = Mass of cube/volume

D = 64/8

D = 8 g/cm³

Therefore, the density of the cube is 8 g/cm³.

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Answer: B

Explanation: I can tell the block weights more since the water went down

Answer:

V = 411.43 V

Explanation:

The two forces as a result of each of the 2 charges are;

F1 = kq1•q/r

F2 = kq2.q/r

Where r = r/2 since we are dealing with potential difference at a point midway between the charges.

q1 = 5 nC = 5 × 10^(-9) C

q2 = 3 nC = 3 × 10^(-9) C

k = 9 × 10^(9) N.m²/C²

r = 35 cm = 0.35m

r/2 = 0.35/2

Thus;

F1 = (9 × 10^(9) × 5 × 10^(-9) × q)/(0.35/2)²

F1 = 1469.39q

F2 = (9 × 10^(9) × 3 × 10^(-9) × q)/(0.35/2)²

F2 = 881.63q

Net force acting midway is;

F_net = F1 + F2

F_net = 1469.39q + 881.63q

F_net = 2351.02q

Now, we know that formula for electric potential is;

V = kq/r

Thus ;

V = Fr/q derived from the earlier equation for force we used.

Where F is F_net.

V = 2351.02q × r/q

V = 2351.02r

Recall that we are dealing with midpoint and r = r/2

Thus;

V = 2351.02 × 0.35/2

V = 411.43 V

renewable sources represent approximately 11% of global energy consumption. However, please note that the percentage may have changed since then, as the adoption and development of renewable energy sources continue to evolve.

The percentage of global energy consumption from renewable sources is subject to change as advancements in renewable technologies, policy changes, and shifts in energy markets occur. It is always important to consult the latest data and reliable sources for the most up-to-date information on global energy consumption and the proportion contributed by renewable sources. as the adoption and development of renewable energy sources continue to evolve. It's always recommended to refer to the most recent and reliable sources for the most up-to-date information on global energy consumption.

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Answer:

P=F/A where F is the weight of the water and A is the area on which it is resting. The weight of the water is mg. The mass of the water is dv where d is the density and v is the volume. Finally, the volume of the water in a vessel is equal to the area of the base of the vessel times the height of the vessel. (v=Ah)

Plugging everything in we get:

P = dAhg/A

So

P=dhg

So we have shown that liquid pressure is directly  proportional to height of liquid in a vessel.​

The estimated temperature of the silica cylinder when operating is approximately 227,273 Kelvin.

To estimate the temperature of the silica cylinder in the radiant wall heater, we can use the Stefan-Boltzmann law, which relates the power radiated by a black body to its temperature. The formula is given by:

P = σ * A * T^4

Where:

P is the power radiated (in watts),

σ is the Stefan constant (6 x 10^-8 Wm^-2K^-4),

A is the surface area of the silica cylinder (in square meters),

T is the temperature of the cylinder (in Kelvin).

First, we need to calculate the surface area of the cylinder. The surface area of a cylinder is given by the formula:

A = 2πrh + πr^2

Where:

r is the radius of the cylinder (in meters),

h is the height of the cylinder (in meters).

Given that the radius (r) is 6 mm, which is 0.006 meters, and the length (h) is 0.6 meters, we can calculate the surface area:

A = 2 * π * 0.006 * 0.6 + π * (0.006)^2

A ≈ 0.227 square meters

Now, let's rearrange the Stefan-Boltzmann law to solve for the temperature (T):

T^4 = P / (σ * A)

T = (P / (σ * A))^(1/4)

Substituting the given power rating of 1.5 kW (1.5 * 10^3 W), and the calculated surface area (A ≈ 0.227), we get:

T ≈ (1.5 * 10^3) / (6 * 10^-8 * 0.227)^(1/4)

T ≈ (1.5 * 10^3) / (1.362 * 10^-8)^(1/4)

T ≈ (1.5 * 10^3) / 0.0066

T ≈ 227,273 Kelvin

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Answer:

maximum horizontal distance = 10m

initial vertical velocity of the ball = 4.9m/s

Explanation:

Complete question

A ball is launched with an initial horizontal velocity of 10.0 meters per second. It takes 500 milliseconds for the ball to reach its maximum height.

Determine the maximum horizontal distance that the ball will travel.

Calculate the initial vertical velocity of the ball.

Maximum horizontal distance x is expressed as;

x = vT

T is total time of flight

T = 2t

Hence x = 2vt

v is the velocity

t is the time

Given

v = 10.0m/s

time t = 500ms = 0.5s

Horizontal distance = 2 * 10 * 0.5

Horizontal distance = 20 * 0.5

Horizontal distance = 10m

Hence the maximum horizontal distance that the ball will travel is 10m

To get the initial horizontal distance, we will use the equation of motion

v = u - gt

T maximum height, v = 0

Substitute

0 = u - 9.8(0.5)

-u = - 4.9

u = 4.9m/s

Hence the  initial vertical velocity of the ball is 4.9m/s

Answer

A spherical bob creates more control for the simple pendulum experiment. An irregular bob like a large piece of paper for instance, will create too much air resistance for a basic classical experiment to yield predictable results within the academic lab.

The temperature rise, in degrees Celsius is determined as 1.7⁰.

The temperature rise, in degrees Celsius is calculated by applying principle of conservation of energy as follows;

Heat gained by the air = heat lost by the heater

mcΔθ = P x t

where;

The energy supplied to the heater is calculated as

E = P x t

E = 1700 w x 600 s

E = 1,020,000 J = 1,020 kJ

The temperature rise, in degrees Celsius is calculated as;

Δθ  = E / mc

Δθ  = ( 1020 ) / ( 320 x 1.87 )

Δθ  = 1.7⁰

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The maximum efficiency of the heat engine with operating temperatures of 580°C and 380°C. is 4.5%.

The maximum efficiency of a heat engine with operating temperatures of 580°C and 380°C can be calculated using the Carnot efficiency formula.

The Carnot efficiency formula is given by:

Efficiency = 1 - (Tc / Th)

where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.

Plugging in the given temperatures:

Efficiency = 1 - (380°C / 580°C) = 1 - 0.655 ≈ 0.345 ≈ 34.5%

Therefore, the correct answer is 34.5%, which represents the maximum efficiency of the heat engine with operating temperatures of 580°C and 380°C.

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Answer:

False.

Explanation:

An aurora is a natural electric phenomenon that creates bright and colorful light displays in the sky. These dramatic and colorful lights are created when electrically charged particles from solar winds enter the Earth's atmosphere and interact with gases in the atmosphere.

The specific strength and specific stiffness of the given fiber-reinforced composite are 2565 MPa/g and 17.62 GPa/g, respectively.

To determine the specific strength and specific stiffness, we need to calculate the strength and stiffness of the composite and then normalize them by the weight fraction of the fibers.

1. Calculate the strength of the composite:

The strength of the composite is determined by the strength of the fibers and the fiber volume fraction. Since the fibers are assumed to fail before the matrix, we can use the fiber strength to calculate the composite strength.

Composite strength = Fiber strength × Volume fraction fibers

Composite strength = 3500 MPa × 0.60

Composite strength = 2100 MPa

2. Calculate the stiffness of the composite:

The stiffness of the composite is determined by the properties of both the fibers and the matrix. We can calculate it using the rule of mixtures.

Composite modulus = (Volume fraction fibers × Fiber modulus) + ((1 - Volume fraction fibers) × Matrix modulus)

Composite modulus = (0.60 × 72.5 GPa) + (0.40 × 2.41 GPa)

Composite modulus = 43.5 GPa + 0.964 GPa

Composite modulus = 44.464 GPa

3. Calculate the specific strength and specific stiffness:

Specific strength = Composite strength / Composite density

Specific strength = (Composite strength / Fiber volume fraction) / (Fiber density + Matrix density)

Specific strength = (2100 MPa / 0.60) / (0.60 × 2.58 g/cm + 0.40 × 1.20 g/cm)

Specific strength = 3500 MPa/g

Specific stiffness = Composite modulus / Composite density

Specific stiffness = (Composite modulus / Fiber volume fraction) / (Fiber density + Matrix density)

Specific stiffness = (44.464 GPa / 0.60) / (0.60 × 2.58 g/cm + 0.40 × 1.20 g/cm)

Specific stiffness = 17.62 GPa/g

The specific strength and specific stiffness of the given fiber-reinforced composite are 2565 MPa/g and 17.62 GPa/g, respectively. These values indicate the strength and stiffness of the composite per unit weight of the material, taking into account the properties of both the fibers and the matrix.

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The heat index, also known as the "feels like" temperature, is a measure of how hot it feels to the human body when relative humidity is factored in with the actual air temperature.

It is typically used during the summer months when high temperatures and humidity levels can lead to increased discomfort and health risks. During the winter months, the heat index is not included in weather reports because the temperatures are generally lower, and the humidity levels are often lower as well. The heat index is specifically designed to provide information about heat-related risks and discomfort associated with high temperatures and humidity. In colder months, the focus of weather reports tends to be on other meteorological factors such as precipitation, wind chill (which factors in the cooling effect of wind on the human body), and freezing conditions. While the heat index may not be included in winter weather reports, meteorologists provide relevant information based on the prevailing conditions to ensure public safety and provide accurate forecasts.

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Answer:

9.0 N

Explanation:

The location of the mass of the wheel on the wheel = Evenly distributed

The acceleration of the solid wheel, α = 3.25 rad/s²

The applied force on the wheel = 4.5 N

The location mass of the replacement wheel = All on (around) the rim

The moment of inertia of the new wheel, I = m·r² (From an online source)

We have;

The moment of inertia for a solid wheel = 1/2·m·r²

The torque, τ = Moment of inertia, I × Acceleration, α

For the solid wheel, we have;

τ  = 1/2·m·r² × 3.25 rad/s²

τ = r × F = r × m × a

For the replacement wheel, we have;

τ  = m·r² × 3.25 rad/s² = 2 × 1/2·m·r² × 3.25 rad/s²

∴ τ = 2 × r × F

Given that the radius remains the same, the force applied on the replacement wheel needs to be doubled

The force that should be exerted on the strap to give the same angular velocity, F' = 2 × F

The required force, F' = 2 × 4.5 N = 9.0 N.

Answer:

46.67 miles/s

Explanation:

...........

Answer:

Explanation:

Add pqq to both sides

3t = pqq + 2 pn                       Pull out p as a common factor.

3t = p(qq + 2n)                       Divide by qq + 2n

3t/(qq + 2n)

Therefore, the input force is 9615.38N

T0 determine the input force needed  0.78 to raise a house corner from its foundation we need to use the formula for mechanical advantage.

Mechanical advantage = output force/ input force

Given the output force  to be 7500N and the mechanical advantage 0.78.

We can rearrange the the formula

IF = 7500/0.78

IF = 9615.38N

Therefore, the input force is 9615.38N

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Answer:

A

Explanation:

The wavelength is the spatial time of an occasional wave, the distance over which the wave's shape rehashes.

Hope this helped!!

Answer:

wavelength

Explanation:

Isotope B (A = 208, Z = 82) is likely to be stable because it has a relatively large mass number (A) and a relatively high atomic number (Z), which indicates a balanced ratio of neutrons to protons in the nucleus.

Stable isotopes generally have a close to 1:1 ratio of neutrons to protons. Isotope A (A = 24, Z = 12) and isotope C (A = 222, Z = 86) have lower atomic numbers and may not have a balanced neutron-to-proton ratio, making them less likely to be stable.

However, it is important to note that stability is also influenced by the specific arrangement of nucleons and nuclear forces, so further analysis would be required to determine stability definitively.

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Answer:

Matter is transferred great distances during conduction. (t think i'm not truly sure)

Explanation:

The direct transfer of energy from one molecule to another is known as conduction. Conduction occurs in solids, liquids, and gases, but it is most effective in solids. Heat transfer by radiation, unlike conduction or convection, does not require any matter.

hope this helps

According to the concept of conduction,matter is transferred great distances during conduction.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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When the electroscope is grounded and a PVC pipe charged with fur is brought near it without touching, the leaves of the electroscope will diverge.

The electroscope is a device used to detect the presence of electric charge. It consists of a metal rod with two thin leaves attached to the bottom. When the electroscope is grounded, any excess charge on the leaves is neutralized and they collapse.

When a PVC pipe is charged with fur, it becomes negatively charged. As like charges repel each other, the negative charge on the PVC pipe repels the electrons in the leaves of the electroscope. Even though the pipe does not physically touch the electroscope, the electric field from the charged pipe causes the electrons in the leaves to move apart, resulting in their divergence. This happens because the electrons in the leaves experience a force of repulsion from the negative charge on the PVC pipe.

Once the charged pipe is withdrawn, the electric field weakens, and the leaves gradually come back together. The electroscope returns to its initial state with the leaves collapsed, indicating that the excess charge has been neutralized.

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Explanation::i dont know the answer ,but pls then also mark me as brainlist

Answer:

When the N. Hemisphere is tilted away from the sun, the S. Hemisphere is tilted toward the sun

Explanation:

Unlike the idiot down there that just wanted point here you go

The displacement current (Id) between the square plates of the capacitor is approximately 7.136×10⁻¹¹ Amperes.

The displacement current (Id) between the square plates of a capacitor with sides measuring 7.6 cm, when the electric field is changing at a rate of 1.4×10⁶ V/m⋅s, can be calculated using Maxwell's equations.

The displacement current (Id) is a term introduced by James Clerk Maxwell to account for the changing electric field in a region where a current is not flowing. According to Maxwell's equations, the displacement current is given by the formula:

Id = ε₀ * dΦE/dt

where ε₀ is the permittivity of free space (approximately 8.854×10⁻¹² F/m) and dΦE/dt represents the rate of change of the electric flux through the capacitor plates.

To calculate dΦE/dt, we need to consider the area of the plates and the rate of change of the electric field. Given that the plates are square and have sides measuring 7.6 cm, the area of each plate is (7.6 cm)² = 57.76 cm² = 5.776×10⁻³ m².

The electric field change rate is given as 1.4×10⁶ V/m⋅s. To find dΦE/dt, we multiply this value by the area of the plates:

dΦE/dt = (1.4×10⁶ V/m⋅s) * (5.776×10⁻³ m²) = 8.0864 A

Finally, we can calculate the displacement current using the formula:

Id = ε₀ * dΦE/dt = (8.854×10⁻¹² F/m) * (8.0864 A) = 7.136×10⁻¹¹ A

Therefore, the displacement current (Id) between the square plates of the capacitor is approximately 7.136×10⁻¹¹ Amperes.

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Answer: layoff

Explanation:

From the information in the question, we can see that Jane is trying to reduce the size of the workforce here through layoff.

Since Joan explains that the termination is temporary, then it's a layoff. If it were to be firing, the termination won't be temporary but permanent as they can't be recalled by the company. But since the employees are discharged temporarily, it's a layoff.

The magnitude of the induced electric field at a point near the center of the solenoid and 0.500 cm from the axis of the solenoid is 1.07 × 10⁻⁴ V/m,

The magnitude of the induced electric field at a point near the center of the solenoid and 1.00 cm from the axis of the solenoid is 4.284 × 10⁻⁴ V/m.

Total no. of turns on the solenoid = 900 turns/m

Radius of solenoid = 2.50 cm = 0.025m

Rate of increase in current = 48.0 A/s  

The magnetic field inside the solenoid,

B = μ₀nI

Where,

n = no. of turns per unit length

n = 900 turns/m

I = current flowing through the solenoid= 0 + 48t= 48t

T = 0s → I = 0

T = ∞ → I = 48

T = t

B = 4π × 10⁻⁷ × 900 × 48t

B = 1.363 T

The induced electric field at a point near the center of the solenoid.

(a) 0.500 cm from the axis of the solenoid

Area of the loop,

A = πr²

   = π(0.005)²

A = 7.85 × 10⁻⁵m²

Enclosed current,

I = nA × I

  = 900 × 7.85 × 10⁻⁵ × 48tI

  = 0.3396t

Magnetic flux,

Φ = BA = 1.363 × 7.85 × 10⁻⁵

Φ = 1.070 × 10⁻⁴ Wb

Induced electric field

E = - (dΦ/dt)

E = -d/dt (1.070 × 10⁻⁴)

E = - (-1.070 × 10⁻⁴)/dt

E = 1.07 × 10⁻⁴V/m(

b) 1.00 cm from the axis of the solenoid

Area of the loop,

A = πr² = π(0.01)²

A = 3.14 × 10⁻⁴m²

Enclosed current

I = nA × I

  = 900 × 3.14 × 10⁻⁴ × 48t

I = 1.36224t

Magnetic flux,

Φ = BA = 1.363 × 3.14 × 10⁻⁴

Φ = 4.284 × 10⁻⁴ Wb

Induced electric field,

E = - (dΦ/dt)

E = -d/dt (4.284 × 10⁻⁴)

E = - (-4.284 × 10⁻⁴)/dt

E = 4.284 × 10⁻⁴V/m

Hence,

the magnitude of the induced electric field at a point near the center of the solenoid and 0.500 cm from the axis of the solenoid is 1.07 × 10⁻⁴ V/m,

and

the magnitude of the induced electric field at a point near the center of the solenoid and 1.00 cm from the axis of the solenoid is 4.284 × 10⁻⁴ V/m.

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