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christopher mar christopher mar
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Posts: 559
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6 years ago
A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. Under the same compression d, the spring is now used to launch a mass of 2m. How high does this second mass rise?
 a. h
  c. h/1.41
  b. h/2
  d. h/4



[Ques. 2] Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
 a. 1
  c. 3
  b. 2
  d. 4



[Ques. 3] A parachutist of mass 50.0 kg jumps out of an airplane at a height of 800 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?
 a. 49,400 J
  c. 391,000 J
  b. 98,700 J
  d. 489,000 J



[Ques. 4] Entropy is a measure of the _____ of a system.
 a. disorder
  c. heat
  b. temperature
  d. internal energy



[Ques. 5] I drop a 60-g golf ball from 2.0 m high. It rebounds to 1.3 m. How much energy is lost?
 a. 0.29 J
  c. 0.88 J
  b. 0.41 J
  d. 1.0 J



[Ques. 6] The surface of the Sun is at approximately 5700 K, and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 2000 J of heat energy is transferred from the Sun to the Earth?
 a. 5.78 J/K
  c. 7.24 J/K
  b. 5.97 J/K
  d. 6.55 J/K



[Ques. 7] A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 24 N, what is her speed at the bottom?
 a. 5.0 m/s
  c. 11 m/s
  b. 10 m/s
  d. She stops before she reaches the bottom.



[Ques. 8] A cylinder containing an ideal gas has a volume of 3.0 m3 and a pressure of 1.0  105 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is 9.0  105 J. Find the change in entropy of the block associated with the heat transfer to the gas.
 a. 0
  c. -1700 J/K
  b. +670 J/K
  d. -1100 J/K



[Ques. 9] A girl and her bicycle have a total mass of 40.0 kg. At the top of the hill her speed is 5.0 m/s, and her speed doubles as she rides down the hill. The hill is 12.0 m high and 100 m long. How much kinetic energy and potential energy is lost to friction?
 a. 2420 J
  c. 2000 J
  b. 3200 J
  d. 3920 J



[Ques. 10] An avalanche of ice and snow of mass 2500 kg slides a vertical distance of 160 m down a mountainside. If the temperature of the ice, snow, mountain, and surrounding air are all at 0C, what is the change in entropy of the universe?
 a. 14,000 J/K
  c. 1400 J/K
  b. 10,000 J/K
  d. 1100 J/K
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wrote...
6 years ago
1)  B

2)  A

3)  C

4)  A

5)  B

6)  D

7)  B

8)  C

9)  B

10)  A
wrote...
6 years ago
Extremely helpful
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