1- the impule experienced by a body is equivalent to a change in: a- velocity b-

Question

1- the impule experienced by a body is equivalent to a change in:

a- velocity b- kinetic energy c- momentum d- none of the above

2- alex throws a .15 kg rubber ball down onto the floor, the balls speed just before the impact is 6.5 m/s and just after is 3.5m/s what is the magnitude of the change in the balls momentum?

a- .09 kg m/s b- 1.5kg m/s c- 4.3 kg m/s d- 126 kh m/s

3- two particles collide, one of them initially being at rest. is it possible for both particels to be at rest after the collision?

a- if collision is perfectly inelastic, then this happens b- if the collision is elastic , then this happens

c- this can happen sometimes if the more massive partice was at rest d- no

4- a 20 g bullet moving at 1,000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s is the block had been originally at rest and is free to move, what is the resulting speed?

a- 9 m/s b- 18 m/s c- 90 m/s d- 900 m/s

5- two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collsion. what is the final velocity of the first ball after collision?

a. -2.0 m/s b. -1.0 m/s c. -0.5 m/s d. 1.0 m/s

6- in an automobile collision, how does an airbag lessen the blow to the passenger? assume as a result of the collision, the passenger stops.

a- the airbag decreases the momentum change of the passenger in the collision

b- during the collision the force from the airbag is greater than would be the force from the windsheild or dashboard so the passenger cannot hit the hard objects

c- the stopping impulse is the same for either the hard objects of the airbag

d- the airbag is there to insure the seatbelt holds.

7- a grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?

a- 3.2 rad/s b. 26 rad/s c. 52 rad/s d. 81 rad/s

Explanation / Answer

1 - Choice C

2 - Choice B (1.5 kg m/s)

3 - Choice D (No, that would not conserve momentum)

4)

mv = (Mv ) + mv

(.02)(1000) = (.02)(100) + 1(x)

x = 18 m/s

Choice B

5) Choice B (They switch)

6) Choice C

7) 8.3(2pi) = 52

Chocie C

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