1. In each of the following situations, a block on an incline is pushed by a han
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1. In each of the following situations, a block on an incline is pushed by a hand. In all cases, the hand exerts a nonzero force parallel to the incline, and the initial speed of the block is D For each of the situations described below, state whether the specified quantities are positive, negative, or zero. Explain. The block moves up the incline and speeds up. a. the work done on the block by the hand(Ifthere is no such work, state so explicitly.) · Block speeds up Frictionless incline the work done on the block by the Earth (If there is no such work, state so explicitly.) · the work done on the hand by the block (If there is no sach work, state so explicitly ) b. The block moves down the incline and speeds up. the work done on the block by the hand (If there is no such work, state so explicitly.) · Block speeds up Frictionless incline The block moves down the incline and slows down. (Note that the hand is now pushing down the ramp and that the ramp has friction.) c- the work done on the block by the hand (If there is no such work, state so explicitly.) Block slows down Incline with friction Tutorials in Introductory Physics McDermott, Shaffer, and P.E.G., U. Wash. OPrentice Hall, Inc. First Edition, 2003Explanation / Answer
1 a) the work done on the block by hand is positive as the force is applied upwards and displacement is upwards.
the work done by earth is negative since force is opposite to displacement.
the work done on hand by block is negative since force is applied downward which is reaction to force by hand on force.howver the displacement is upward.
b)it is negative and force is applied in upward direction and displacement is downward
c) it is positive as foce applied is in direction of displacement
2.a) there is work done on the system. since Pv would increase it means PV=nrt. So temperature would alsoo increase.
b)Internal energy would increase since there is work done on the system
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