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galina1969 [7]
3 years ago
11

Can someone help me with b, d and e? Please need this today

Physics
1 answer:
Sergeeva-Olga [200]3 years ago
7 0

Answer:

Explanation:

a) the free body diagram of the lower pulley would have two force vectors of equal magnitude acting upward and the block weight acting downward. These must balance so 2F = Wt

                                          F = 262/2 = 131 N

b) as the force needed is half of the block weight, the mechanical advantage is 262 / 131 = 2

c) with a mechanical advantage of 2, he would have to pull twice the distance of block motion or 2(3.00) = 6.00 m

d) W = Fd = 131 N(6.00 m) = 786 J

which is the same as the increase in potential energy of the block

e) W = mgh = 262(3.00) = 786 J

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Why doesn't the principle of mechanical energy conservation hold in situations when frictional forces are present?
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