A nonzero net force acts on an object. Which of the following quantities could b

Question

A nonzero net force acts on an object. Which of the following quantities could be constant? A. the object's kinetic energy B. the object's velocity C. the object's momentum D. all of the above E. None of the above 6. 7. The block sits at rest on the slide, held by friction. There is no friction between the slide and the ground. The slide sits still on the ground, held by hand. If let go the slide, it will A. Moves to the right Friction here B. Moves to the left C. Doesn't move No friction here D. Can move either way. A 20 g bullet is shot with an initial velocity y into a 5 kg wood block attached to the ceiling with massless strings. The collision happens so rapidly that the block doesn't change position appreciably until after the bullet stops. When does the momentum of the bullet plus block remain constant? A. When the bullet approaches B. When the bullet stops moving in the block. C. When the block swings upward. D. Both A and C E. Both B and C. F. Both A and B. G. It never is conserved. H. It always is conserved. 8. Bullet Blos ( out 7 Complete nroblem 9-17, Show work.

Explanation / Answer

6)(E)None of the above

Fnet = ma

So the object is accelerating, so velocity is not constant, since velocity is not constant, acceleration, momentum and KE are also not constant.

7)(C)Doesnt move

The momentumof the system needs to be conserved since intially none of them is moving and the small mass id still intact even while the hand leaves the incline, the system will not move to keep the momentum conserved.

8)(H)It is always conserved.

The momentum of the block bullet system remains conserved all the time.

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