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- Which of the following describes the difference between speed and velocity?

Speed is a vector, but velocity is a scalar. | ||

Velocity has direction, but speed does not. | ||

Speed has direction, but velocity does not. | ||

Velocity is an average value, but speed is always an instantaneous measurement. |

- In the International System of Units, length is measured using which of the following units?

m | ||

km | ||

kg | ||

N |

- Which one of the following statements is not true regarding projectile motion when we ignore air resistance?

Projectile motion shows a curved path near the surface of the Earth. | ||

The horizontal motion of the projectile does not slow down. | ||

The horizontal component of the velocity changes continuously. | ||

The vertical component of the acceleration is downward. |

- If the mass of a vehicle is 100 kg, what is the weight of the vehicle on Earth? The acceleration due to gravity on Earth is 9.8 m/s
^{2}.

9.8 N | ||

98 N | ||

980 N | ||

9800 N |

- The initial kinetic energy in a system was 0 J, and the initial potential energy was 500 J. If the final kinetic energy is measured as 500 J, what is the final potential energy of the system? Ignore frictions.

0 J | ||

50 J | ||

100 J | ||

500 J |

- The initial kinetic energy in a system was 0 J, and the initial potential energy was 2500 J. If the final kinetic energy is measured as 2500 J, what is the final potential energy of the system? Ignore frictions.

0 J | ||

50 J | ||

100 J | ||

500 J |

- The hand on a stopwatch makes one complete revolution every two seconds. What is the angular speed of this hand in radians per second?

0.32 rad/s | ||

0.64 rad/s | ||

6.28 rad/s | ||

3.14 rad/s |

- A girl exerts an average force of 50 N on a toy cart for 0.5 seconds. What is the impulse?

25 N/s | ||

250 N/s | ||

100 N/s | ||

10 N/s |

- A spring has a spring constant of 10 N / m. Find the magnitude of the force needed to compress the spring by 0.1 m.

0.1 N | ||

1 N | ||

10 N | ||

100 N |

- When considering a rigid body rotation, let the mass be
*m*, the linear velocity be*v*, the angular velocity be*w*, and the moment of inertia be*I*. Which one of the following expressions allows one to calculate the angular momentum for the rigid body about a fixed axis?

1/2 mv^{2} |
||

1/2 Iw^{2} |
||

mv |
||

Iw |

- The mass of a cube is 270 kg, and the length of the side of the cube is 3 meters. What is the mass density of the cube?

10 kg/m^{3} |
||

30 kg/m^{3} |
||

90 kg/m^{3} |
||

100 kg/m^{3} |

- April has two freezers in her laboratory. Inside freezer A, the temperature is 0°F, and inside freezer B the temperature is 0°C. Which one of the following statements about these freezers is true?

The inside of freezer A is colder than the inside of freezer B. | ||

The inside of freezer B is colder than the inside of freezer A. | ||

A and B are at the same temperature. | ||

There’s no way to compare the temperatures of these two freezers because the units are different. |

- The efficiency of a Carnot engine is
*e*= 1 –*T*, where T_{c}/ T_{H}is the temperature of the cold reservoir, and T_{c}is the temperature of the hot reservoir. At what temperature will the engine have 100% efficiency?_{H}

T = 0 K_{c} |
||

T= 0 K_{h} |
||

T = 100 K_{c} |
||

T = 100 K_{h} |

- Select the best description of the first law of thermodynamics

The change in internal energy is heat minus work. | ||

The change in internal energy is heat plus work. | ||

When work is done by the system, the work is negative. | ||

When work is done on the system, the work is positive. |

- Which one of the following variables is the best indicator of thermal equilibrium between two systems in thermal contact?

Pressure | ||

Temperature | ||

Volume | ||

Mass |

- Consider an isothermal expansion of an ideal gas. If the work done by the monatomic gas is given as 3000 J, what is the heat supplied to the gas?
Your response must be at least 75 words in length and should include any equations that are needed to answer the problem.

- A system does 100 J of work to its surroundings and gains 50 J of heat in the process. Calculate the change in the internal energy of the system. Determine if the internal energy is increased or decreased during the process.
Your response must be at least 75 words in length and should include any equations that are needed to answer the problem.

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