LONG QUIZ GENERAL PHYSICS 1

A 4.00 kg uniform solid cylinder is rotated about its central axis. If its moment of inertia is 0.218 kg⋅m², determine the radius of the cylinder.

• I = 2.3 kg⋅m²

• I = 6.1 kg⋅m²

• I = 1.6 kg⋅m²

• I = 0.5 kg⋅m2

A 4.00 kg uniform solid cylinder is rotated about its central axis. If its moment of inertia is 0.218 kg⋅m², determine the radius of the cylinder.

• r = 0.330 m

• r = 0.872 m

• r = 0.0545 m

• r = 18.34 m

Suppose 900 N is applied downwards to one end of a 0.80 m lever which makes a 71° angle with the vertical. Calculate the magnitude of the torque applied on the lever.

• 720 Nm.

• 680 Nm.

• 1125 Nm.

• 8.88x10^-4 Nm.

An engineer working at the International Space Station plays with a stick. The stick is initially not spinning and is at zero gravity. The engineer measures that the angular momentum of the stick increased from 0 to 10 kg·m2/s for a time interval of 0.5 seconds. How much torque was given by the engineer?

• 20 N·m

• 5 N·m

• 0.05 Nm.

• .02 Nm.

A Ferris wheel engine can provide a torque of 7 ✕ 10⁶ N·m during a startup period of 20 seconds. If the Ferris wheel starts from rest and accelerates during the startup period, how much angular momentum did it gain from its engine?

• 14.1 ✕ 10⁷ kg·m²/s

• 3.5 ✕ 10⁵ kg·m²/s

• 35.0 ✕ 10⁵ kg·m²/s

• 1.4 ✕ 10⁷ kg·m²/s

A hungry man rotates a food tray in quest to reach the fine turkey. Suppose that he exerts a force of 3.0 N that is directly perpendicular to the radius of the food tray at a time interval of 0.7 seconds. Given that the initial angular momentum of the food tray is zero, what is the final angular momentum of the food tray after the man applied a torque? The radius of the food tray is 0.3 meters.

• 0.63 kg·m²/s.

• 7 kg·m²/s.

• 0.07 kg·m²/s.

• 6.30 kg·m²/s.

An object with a weight of 10 N is suspended at the 0 m end of a 10 N meter stick. Is the system in static equilibrium if a support force is applied at the 25 cm mark?

• 20.0

• 0

• 25.0

• 0.25

Calculate the magnitude of the gravitational force exerted by the earth (m = 5.97 ✕ 10²⁴ kg) on the moon (m = 7.35 ✕ 10²² kg) if the distance between them is 3.84 ✕ 10⁸ m.

• 1.19 ✕ 10¹¹ N

• 4.39 ✕ 10⁴⁷ N

• 1.98 ✕ 10²⁰ N

• 9.43 ✕ 10⁴⁷

A 55 kg person weighs 540 N. Calculate the weight of the person at the surface of the moon with mass m M = 7.35 ✕ 10²² kg and radius RM = 1.74 ✕ 10⁶ m.

• 99 N

• 98 N

• 88 N

• 89 N

The gravitational acceleration on a planet is 8.995 m/s². If its mean radius is 25 362 km, what is the mass of this planet?

• 8.67 ✕ 10²⁵ kg

• 7.68 ✕ 10²⁵ kg

• 6.78 ✕ 10²⁵ kg

• 8.76 ✕ 10²⁵ kg