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A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas? a) 400 J b) - 400 J c) zero d) none of the above

Can you use a heat pump to provide the temperature difference to run a heat engine? Yes, a heat engine runs on heat. Yes, a heat pump moves heat. No, heat is not created. No, the heat supplied does not create a large enough temperature difference.

Calculate the kinetic energy in joules of a 10g bullet moving at 300 m/s

Your average speed on the first half of a car trip is 69.0 km/h. How fast do you have to drive on the second half of the trip to achieve an average speed of 82.0 km/h for the whole trip

Suppose you are measuring the height of a small child. What will determine the number if significant digits you record?

A star has a mass of 1.36 x 1030 kg and is moving in a circular orbit about the center of its galaxy. the radius of the orbit is 2.1 x 104 light-years (1 light-year = 9.5 x 1015 m), and the angular speed of the star is 1.1 x 10-15 rad/s.

Floating in deep space, you find yourself at rest next to a small asteroid. You reach out and tap the asteroid with a hammer. What happens to you in this process?

You walk forward at 1.5 m/s for 8s. Your friend decides to walk faster and starts out at 2.0 m/s for the first 4 s. Then she slows down and walks forward at 1.0 m/s for the next 4s. Make a distance-time graph of your motion and your friend's motion.

If the coolant in a refrigerator was not compressed back into a liquid after it flowed through the refrigerator what would happen

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i. e, what is the motion's frequency?