A machine is used to convert heat energy into work energy, and is connected to a cooling system which keeps the machine at a constant temperature. If 2000 kJ of heat energy enter the machine, and the machine performs 700 kJ of work,

how much heat energy must still be removed by the cooling system?

Remember What the law of Conservation of energy says about the total energy before and after a transformation.

Answer:

I don't know.

Explanation:

I have no idea what you are referring to.

Answer:

60Joules

Explanation:

Potential energy is the amount of 'work done' on an object, by changing it's position.

The formula is gravitational Potential energy= mass (kg) × gravity (Newtons) × height (m)

The solar system is smaller than a galaxy. Galaxies are composed of solar systems. The solar system is composed of planets revolving around a star (such as our sun). To put into perspective, there are about hundreds of billions of stars in our galaxy (the milky way). On the other hand, billions of galaxies make up the universe.

The speed of light is constant which is 299 792 458 m / s. The time is taken for light to reach an object can be used to measure the distance between objects in space. This is done by multiplying the time by the speed of light.

Distance in space is so vast and therefore impractical to use the basic SI units of meters and kilometers we use here on earth. Therefore the use of astronomical units and light years is used. Light years is the distance that light can cover in a year in the vacuum of space, while astronomical units is the distance between solar systems.

Answer:

Atoms

Explanation:

Answer:

All matter is made up of atoms. Atoms come together to form molecules, which are the building blocks for all types of matter.

Explanation:

Answer:

The triboelectric effect is an electrical phenomenon where certain materials become electrically charged after coming into contact with another, different, material. The polarity and strength of the charges produced differ according to material and surface smoothness.

Explanation:

The triboelectric effect causes an electrostatic charge to build up on the fur due to the cat's motions. The electric field of the charges results in a slight attraction of the light plastic pieces to the charged fur. The triboelectric effect is also the cause of static cling in clothes.

I hope this helps, if it doesn't then just message me and ill be more than happy to help :)

Answer:

100 m / s^

F =ma from this divided F and ma by m to get acceleration

a = F / m

a = ?

F = 5 N

m = 50 g = 0. 0 5 kg ; if 1 kg = 1000g how much kg of 50 g by criss cross method we get 0.05 kg

so; 5N / 0. 05 kg = 5kg m / s^ / 0.05 kg

kg cancel by kg

the result is 100 m/ s^

Answer:

Just get searched then go back to class

Explanation: similar situation

Whenever the circuit is turned on, each of these elements has the same current through it. The correct option is A.

The current is stream of charges flowing through circuit from the positive terminal to the negative terminal of the voltage source.

A series circuit consists of a switch, a 6-v battery, a lightbulb, and some copper wire. The circuit has the current I flowing in it.  Light bulb will act as resistor. When the circuit is on, current will flow through the entire circuit and its elements starting from the positive terminal of battery to the negative terminal of battery.

Thus, whenever the circuit is turned on, each of these elements has the same current through it. The correct option is A.

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The statement indicating that 'Gravitation always does negative work' is FALSE.

Gravitation is a fundamental physical force that makes objects attract each other in the Universe.

This force (Gravitation) is required to maintain both constant positions and movement of objects.

In conclusion, the statement indicating that 'Gravitation always does negative work' is FALSE.

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Answer:false

Explanation:

The spring constant of the spring if it would compress by 1 m to stop the ore car is 340,350.4 N/m.

The potential energy of the car is calculated as follows;

P.E = mgh

where;

sin (10) = h/L

h = L x sin(10)

P.E = mgLsin(10)

P.E = 2000 x 9.8 x 50 x sin(10)

P.E = 170,175.21

The potential energy of the car at the top of the incline will be converted  to the elastic potential energy spring at the bottom of the incline.

P.E = U = ¹/₂kx²

k = (2U)/x²

k = (2 x 170,175.2)/(1)²

k = 340,350.4 N/m

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Answer: Type I Error

Answer:

False

Explanation:

Scientific models are not always built to scale and may not be fully accurate

Answer:

visible waves are needed for green plants to grow.

Explanation:

During photosynthesis, chlorophyll absorbs energy from blue- and red-light waves, and reflects green-light waves, making the plant appear green.

The ratio v1/v2 of the speed of the comet at position 1 to the speed at position 2 will be the ratio of the angular velocity.

Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.

It should be noted that the tangential speed can alternatively be represented as;

[tex]\rm v_t= r\frac{d\theta}{dt}[/tex]

where,

θ  is the comet's position angle with respect to some given direction.

The amount dθ/dt is known as angular speed

The ratio v1/v2 of the speed of the comet at position 1 to the speed at position 2 IS;

[tex]\rm \frac{v_1}{v_2} = \frac{\frac{d \theta_1}{dt_1} }{\frac{d \theta_2}{dt_2} } \\\\\ \frac{v_1}{v_2} =\frac{\omega_1}{\omega_2}[/tex]

Hence,the ratio v1/v2 of the speed of the comet at position 1 to the speed at position 2 will be the ratio of the angular velocity.

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An audience member covers her ears during a loud concert shows evidence that matter can reflect waves.

An audience member covers her ears during a loud concert is an event that provides evidence that matter can reflect waves because a sound is heard again and again due to the reflection of waves. This repetition of sound is due to the property of reflection of sound waves.

So we can conclude that an audience member covers her ears during a loud concert shows evidence that matter can reflect waves.

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Answer:

A laser beam bounces off a series of mirrors

Explanation:

The size of contact force from the ground is determined as 8000 N.

According to Newton's third law of motion, action and reaction are equal and opposite.

The size of contact force from the ground is equal to the weight of the rock and it is calculated as follows;

Fd = Fn

Fd = 8000 N

Thus, the size of contact force from the ground is determined as 8000 N.

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Answer:

Ultrasound imaging (sonography) uses high-frequency sound waves to view inside the body.

Explanation:

The decrease in kinetic energy during collision is 0.171 joule. Hence, option (D) is correct.

The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity.

The body holds onto the kinetic energy it acquired during its acceleration until its speed changes. The body exerts the same amount of effort when slowing down from its current pace to a condition of rest.

Hence, the decrease in kinetic energy during collision =

Total initial kinetic energy - total final kinetic energy

= {1/2 × 1.15 ×(1.05)² + 1/2 ×2.25 × 0² - (1/2 × 1.15 × 0.13² + 1/2 ×1.25 × 0.85²)} Joule

= { 0.633 + 0 - 0.010 - 0.452} joule

= 0.171 joule.

Hence, The decrease in kinetic energy during collision is 0.171 joule.

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Answer:

yes

Explanation:

because when the water is heating up you use more fuel than you do when it is cold

[tex]\text{Weight,}~ \\\\W = mg = 45 \times 9.8 = 441~ N\\\\\text{The weight of the object on earth is 441 N}.[/tex]

The safest option in the lab if one need your vision to be corrected is  wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your ta or instructor for your school's policy.

When someone is performing any project in the chemistry lab, he needs to be extra care taken by himself and and the most importantly from the school. The safety goggles are used to protect the eyes from any spiling off the chemical.

One should wear corrective glasses under the safety goggles during the whole experiment.

Thus, wear corrective glasses under the safety goggles during the whole experiment.

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The statement true about the analog signal is they can capture the entire sound wave when a song is recorded on a vinyl record, resulting in a Fuller and more accurate representation of the original song.

The analog signals are discrete in nature.

Sound can be recorded, stored and played by the use of either digital or analog techniques.

Vinyl records produces a continuous sound wave vs CDs. So, analog is more accurate,

Thus, correct option is 1.

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The procedure is not found here but a chemical reaction is characterized to be a process where substances are converted into products.

A chemical reaction is a process where one or more reactants are converted into chemical products.

In a chemical reaction, enzymes are molecules that speed up the process by lowering its activation energy.

In conclusion, the procedure is not found here but a chemical reaction is characterized to be a process where substances are converted into products.

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Answer:

  2.0 A

Explanation:

Current through series-connected components is the same.

__

If the components are connected in series, and the current through one of them is 2.0A, then the current through the other is also 2.0A.

The current through the 4.0 Ω resistor is 2.0 A.

Explanation:

Explain why this doesn't violate the law of conservation of energy.

The bulbs shine less brightly in a parallel because the charges

are flowing to more than one place, distributing the charge

evenly between the two bulbs. Less charge is going to each bulb

since it is going two places, so they will appear less bright

The kinetic energy of a bowling ball moving at speed is 100 J. The correct option is B.

The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as

K.E = 1/2 mv²

Given is the Mass of a bowling ball, m =8 kg and Velocity of a baseball, v = 5 m/s

substitute the values, we have

K.E = 1/2 x 8 x (5)²

K.E = 100 J

Hence, the kinetic energy of the bowling ball is 100 J.

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Answer:

C. to apply lasers to precision measurements of the nucleus

Explanation:

Magnetic resonance imaging (MRI) is based on the principles of nuclear magnetic resonance (NMR), a spectroscopic technique used to obtain microscopic chemical and physical information about molecules.

[tex]~~~~~~~F = mg\\\\\implies F = 0.2 \times 9.8\\\\\implies F = 1.96~N\\\\\text{The downward force is 1.96 N.}[/tex]