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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.

C | I | Question | Answer |
---|---|---|---|

12 | A cylinder containing an ideal gas has a volume of 2.0 m3 and a pressure of 1.0*10^5 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 6.0*10^5 J. Find the change in entropy of the block associated with the heat transfer to the gas. | -1100 J/K | |

11 | I take 1.0 kg of ice and dump it into 1.0 kg of water and, when equilibrium is reached, I have 2.0 kg of ice at 0°C. The water was originally at 0°C. The specific heat of water = 1.00 kcal/kg*°C, the specific heat of ice = 0.50 kcal/kg*°C, and the latent heat of fusion of water is 80 kcal/kg. The original temperature of the ice was: | -160°C | |

5 | A 2.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 10.0-m-deep well. After the ball comes to a stop in the mud, the sum of its potential and kinetic energy is: | -196J | |

7 | A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following? | -2 | |

12 | A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. What is its change in internal energy? | -20 J | |

6 | Two identical 7-kg bowling balls roll toward each other. The one on the left is moving at +4 m/s while the one on the right is moving at -4 m/s. What is the velocity of each ball after they collide elastically? | -4 m/s, +4 m/s | |

10 | At what temperature is the same numerical value obtained in Celsius and Fahrenheit? | -40° | |

10 | A temperature of 233 K equals which of the following? | -40°F | |

8 | Two children seat themselves on a seesaw. The one on the left has a weight of 400 N while the one on the right weighs 300 N. The fulcrum is at the midpoint of the seesaw. If the child on the left is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced, what is the torque provided by the weight of the child on the right? | -600 Nm | |

12 | The volume of an ideal gas changes from 0.40 to 0.55 m^3 although its pressure remains constant at 50 000 Pa. What work is done on the system by its environment? | -7500 J | |

6 | A ball with original momentum +4.0 kg×m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is: | -8.0 kg*m/s. | |

6 | A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move? | -9.7 kJ | |

5 | A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface. If the cart accelerates at 2.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart? | -900J | |

5 | A satellite is held in orbit by a 2 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is: | 0 | |

5 | I use a rope 2.00 m long to swing a 10.0-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight? | 0 |

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