Question

By the principle of rotational inertia, a broom is easier to balance on your hand if

A) the wider part is away from hand

B) the wider part in on the hand

C) while the broom stays horizontally

D) none of them

The purpose of using air bag in vehicles is to

A) reduce the time of impact

B) increase the time of impact

C) reduce maximum force and increase time of impact

E) none of these

Answer 1

a)The broom is easy to handle when the wider part is away from the hand.

Rotational inertia depends on whether the mass is farther or closer to the point of rotation. The farther the mass is, the higher the rotational inertia.

b)C is the answer.

The purpose of airbag is to help the passenger reduce their speed of collision without injuries.The more time the force has to act on the passenger to slow them down,the less damage caused to passenger.

The purpose of the airbag is to provide a vehicleoccupant with a soft cushioning and restraint during a crash event. It can reduce injuries between the flailing occupant and the interior of thevehicle.