see if you can answer this physics problem? I'm a teacher who works at the U of M and i'm seeing who can it.

Question

Assume a 9 kg bowling ball moving at 1 m/s bounces off a spring at the same speed that it had before bouncing.

(a) What is its momentum of recoil? (kg·m/s)

(b) What is its change in momentum? (Hint: What is the change in temperature when something goes from 1 degree to -1 degree?) (kg·m/s)

(c) If the interaction with the spring occurs in 0.5 s, calculate the average force the spring exerts on it. (N)

Good Luck!

Answer 1

I am your high school teacher,
and I traced your IP address,
and your F well deserved for cheating is awaitng you.

Answer 2

Rsewein blew part (a) of the above problem. The momentum of recoil is the change of momentum absorbed by the spring/earth system, which is the same as the change in momentum bowling ball or 18 kg*m/s. Other than that error, his/her answer is correct.

Your problem also does not say if the bowling ball was rolling. It it were, a whole new set of problems is created because angular momentum is also conserved. But I don't think you have learned about that yet so that angular momentum can be ignored. This is also a dead give away about your level of knowledge, which is one reason most of the answerers responded the way they did.

Lastly, don't troll for knowledgable answerers by enticing them with what looks like a tough challenging problem and is in fact very easy. You would do better by just saying that "I know I should understand this, but I don't"

Good luck.

Answer 3

(a) knowing the that the ball hits the spring and bounces off at the same speed the recoil of the spring would be equal to the momentum of the ball.

recoil = mass of ball * velocity = 9 * 1 = 9 kg m / s

(b) once again knowing that the ball hits and leaves at the same speed.

change in momentum = mass of ball * initial velocity - mass of ball * final velocity = 9 * 1 - 9 * (-1) = 18 kg m / s

final velocity is in the opposite direction, hence the opposite sign (negative)

(c) Impulse = change in momentum = Average Force * time

from part (b)

18 = Average Force * 0.5

Average Force = 36 N

Answer 4

you should do your own homework
good luck

Answer 5

a) un
b)dos
c)tres