ROTATIONAL MOTION

How does the moment of inertia of a planet affect its rotational period?

• It directly sets the period
• It has no effect
• It influences how torque changes affect angular velocity, but not the period directly
• It determines the planet's orbit

What is the moment of inertia of a body rotating about an axis passing through its center of mass called?

• The maximum moment of inertia
• The minimum moment of inertia for parallel axes
• The average moment of inertia
• The variable moment of inertia

Why is the moment of inertia important in the design of rotating machinery?

• It determines the color
• It affects the lubrication needs
• It determines the torque required to achieve desired angular acceleration
• It sets the operating temperature

What is the moment of inertia of a rectangular plate about an axis along its edge and in the plane of the plate?

• (1/12)Mb²
• (1/6)Mb²
• (1/3)Mb² for width b
• Mb²

How is the moment of inertia of a continuous body calculated in practice?

• By measuring weight
• By averaging all masses
• By integrating r² dm over the volume of the body
• By counting atoms