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
