four men lift a 250 oh box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) how much work do they do in just holding it? (c) why do they get tired while holding it? (g=10m/s)
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) Here, F = mg = 250 x 10 N,
S = 1 m
Work done is given by W = F x S .
= 2500 N x 1 m = 2500 J
(b) No work is done in just holding the weight because there is no displacement
i.e., S = 0, W = FS = 0.
© They get tired because of muscular effort that they have to apply in supporting the weight.
S = 1 m
Work done is given by W = F x S .
= 2500 N x 1 m = 2500 J
(b) No work is done in just holding the weight because there is no displacement
i.e., S = 0, W = FS = 0.
© They get tired because of muscular effort that they have to apply in supporting the weight.
Answered by
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Answer:
a) here - F= mg = 250 × 10 = 2500N
s= 1m
w= fs
2500×1
= 2500J
b) no work is done
c) because they handle the gravitational force acting on the box in downward direction
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