ROTATIONAL MOTION

In a bar suspended by two strings at angles 36.9° and 53.1°, what is the significance of these angles?

• They indicate material strength
• They are random
• They determine tension components
• They affect color

A non-uniform bar is suspended by two strings making 36.9° and 53.1° with the vertical. What determines the position of its center of gravity?

• Length of strings
• Color of the bar
• Balancing of torques and forces
• Temperature

What is the role of symmetry in the L = Iω relation?

• It increases speed
• It reduces mass
• It changes direction of force
• It ensures L and ω are parallel

When is the relation L = Iω valid for a rigid body?

• For all rotating bodies
• When I is variable
• Only for point masses
• When rotating about a symmetric fixed axis

What is the condition for angular momentum L to be parallel to angular velocity ω?

• Always true
• When mass is zero
• Only in space
• Rotation about a fixed symmetric axis