hoop: I = mr disk: I = (1/2)mr point mass: I = mr |

**QUESTION 1**

1. A torque of 0.97 N·m is applied to a bicycle wheel of radius 35 cm and mass 0.75 kg. Treating the wheel as a hoop, find its angular acceleration. (in rad/s^{2})

**QUESTION 2**

1. When the play button is pressed, a CD accelerates uniformly from rest to 450 rev/min in 3 revolutions. If the CD has a radius of 6 cm and a mass of 0.017 kg, what is the torque exerted on it? (in N·m)

**QUESTION 3**

1. A child exerts a tangential 42.2-N force on the rim of a disk-shaped merry-go-round with a radius of 2.4 m. If the merry-go-round starts at rest and acquires an angular speed of 0.086 rev/s in 3.5 s, what is its mass? (in kg)

**QUESTION 4**

1. A 0.018-kg record with a radius of 0.17 m rotates with an angular speed of 28 rpm. Find the angular momentum of the record. (in kg·m^{2}/s)

** **

**QUESTION 5**

1. A torque of 0.12 N·m is applied to an egg beater. If the moment of inertia of the egg beater is 0.0025 kg·m^{2}, what is its angular speed after 0.65 s, assuming it starts from rest? (in rad/s) (Hint: first find the angular momentum of the egg beater after 0.65 s)

**QUESTION 6**

1. A turntable with a moment of inertia of 0.0054 kg·m^{2} rotates freely with an angular speed of 33 rpm. Riding on the rim of the turntable, 0.15 m from the center, is a cute, 0.032-kg mouse. Calculate the angular speed of the turntable when the mouse reaches the center. (in rpm)

** **

Subject | Science |

Due By (Pacific Time) | 12/03/2014 06:00 pm |

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