highes GPE Level nt than -c + ners the 11 Give specific examples to illustrate t
ID: 2039505 • Letter: H
Question
highes GPE Level nt than -c + ners the 11 Give specific examples to illustrate the following processes system, thereby increasing the kinetic energy with no change in potential enerey on a system, Increasing potential energy with no change in kinetic enerty 12 You apply a force of while its height increases by 3 meters of 2 N. How fast will the moving aft 75 N on a block with a mass of S kg up an incline You push the block 7 meters along the incline, block be moving after you've pushed it 7 meters along the incline? . Also while pushing the block there is a force of friction opposing you with a valueExplanation / Answer
11)
a) When we push a block on a horizontal surface its kinetic energy increases but its potential energy remains constant.
b) If we move a block in upward direction with constant speed.
A positive work is done on the block by us. Then its kinetic energy remains constant but potential energy increases.
12)
Net workodne on the block = W_applied force + W_friction + W_gravity
= 75*7*cos(0) + 2*7*cos(180) - m*g*h
= 75*7 - 2*7 - 5*9.8*3
= 364 J
now use Work-energy theorem,
Wnet = gain in kinetic energy
Wnet = (1/2)*m*v^2
==> v = sqrt(2*Wnet/m)
= sqrt(2*364/5)
= 12.1 m/s <<<<<<<<-------------------Answer
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