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Momentum. I did all of them, can u check if i got them right? thank you

by Ronaldo21
Tags: check, momentum
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Ronaldo21
#1
Dec14-09, 10:38 PM
P: 30
1. A moving car has momentum. If it moves twice as fast, its momentum is TWICE as much.

2. Two cars, one twice as heavy as the other, move down hill at the same speed. Compared to the lighter car, the momentum of the heavier of the heavier car is TWICE as much.

3. The recoil momentum of a gun that kicks is
a. MORE THAN
b. LESS THAN
c. THE SAME AS
the momentum of the bullet it fires, I got C.

4. If a man firmy holds a gun when fired, the momentum of the bullet is equal to the recoil momentum of the
a. GUN ALONE
b. GUN-MAN SYSTEM
c. MAN ALONE
i got B.

5. Suppose you are traveling in a bus at highway speed on a nice summer day and the momentum of an unlucky bug is suddenly changed as it splatters onto the front window.

a. Compared to the force that acts on the bug, how much force acts on the bus?
a. MORE
b. THE SAME
c. LESS
i got B.

b. The time of impact is the same for both the bug and the bus. Compared to the impulse on the bug, this means the impulse on the bus is
a. MORE
b. THE SAME
c. LESS
i got B.

c. Although the momentum of the bus is very large compared to the momentum of the bug, the change in momentum of the bus, campared to the change of the momentum of the bug is
a. MORE
b. THE SAME
c. LESS
i got B.

d. Which undergoes the greater acceleration.
a. BUS
b. BOTH THE SAME
c. BUG
i got C.

and f. Which therefore, suffers the greater damage?
a. BUS
b. BOTH THE SAME
c. THE BUG OF COURSE!
i picked C.

are those correct? thank you very much!
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ideasrule
#2
Dec15-09, 06:03 PM
HW Helper
ideasrule's Avatar
P: 2,322
Yup, all correct.


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