ROTATIONAL MOTION

Which conservation law applies when net external torque is zero?

• Conservation of energy
• Conservation of linear momentum
• Conservation of angular momentum
• Conservation of mass

A rigid body rotates with constant angular velocity. What is the net torque acting on it?

• Maximum
• Zero
• Increasing
• Depends on I

Power delivered to a rotating body is 100 W. If angular speed is 50 rad/s, what is the torque?

• 0.5 N·m
• 2 N·m
• 50 N·m
• 5000 N·m

A force of 40 N is applied tangentially to the rim of a wheel of radius 0.5 m. What is the torque produced?

• 20 N·m
• 40 N·m
• 80 N·m
• 10 N·m

What is the angular momentum of a rotating body with I = 4 kg·m² and ω = 3 rad/s?

• 1.33 kg·m²/s
• 7 kg·m²/s
• 12 kg·m²/s
• 24 kg·m²/s