ROTATIONAL MOTION

A body has rotational kinetic energy of 100 J and moment of inertia 2 kg m². What is its angular velocity?

• 5 rad/s
• 10 rad/s
• 20 rad/s
• 100 rad/s

What is the work done by a constant torque τ in rotating a body through angle θ?

• W = τ/θ
• W = τθ
• W = Iθ
• W = Fθ

A wheel of radius 0.5 m rotates through 4 radians. How much cord is unwound?

• 0.5 m
• 1.0 m
• 2.0 m
• 4.0 m

What is the moment of inertia of a point mass m at distance r from the axis of rotation?

• mr
• mr²
• m²r
• m/r²

If a body rotates with constant angular acceleration, which of the following is true?

• ω = ω₀ + αt²
• ω = ω₀ + αt
• ω = αt²
• ω = ω₀t + α