ROTATIONAL MOTION

A projectile explodes in mid-air. What happens to the trajectory of the center of mass?

• It stops in mid-air
• It moves in a straight line
• It falls vertically
• It continues along the original parabolic path

Which of the following is NOT a property of the center of mass?

• It moves as if all external forces act on it
• It can lie outside the object
• It is the point of balance
• It always lies within the physical boundaries of the object

Where is the center of mass of a uniform hollow cone located along its axis?

• At the apex
• At the base
• At h/2 from the base
• At a distance of h/3 from the base

If a man walks from one end of a boat to the other on still water, what happens to the center of mass of the (man + boat) system?

• It moves forward
• It moves backward
• It oscillates
• It remains stationary

Which of the following shapes has its center of mass outside the material?

• A solid cube
• A solid sphere
• A flat rectangular sheet
• A C-shaped object