ROTATIONAL MOTION

A flywheel of mass 15 kg and radius 0.4 m rotates about its central axis. What is its moment of inertia?

• 0.6 kg m²
• 0.9 kg m²
• 1.2 kg m²
• 1.8 kg m²

How does the moment of inertia of a body change if its mass is doubled and radius remains the same?

• Becomes half
• Becomes twice
• Becomes four times
• Remains same

A torque of 12 Nm produces an angular acceleration of 3 rad/s². What is the moment of inertia?

• 2 kg m²
• 3 kg m²
• 4 kg m²
• 6 kg m²

What happens to angular acceleration if the applied torque is tripled while moment of inertia remains unchanged?

• Doubles
• Becomes three times
• Halves
• Remains same

If a body rotates with constant angular velocity, what is the net torque acting on it?

• Constant
• Zero
• Maximum
• Negative