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Twenty identical cubical blocks each of mass 100gm and of side 10cm are lying on a horizontal surface. Work done in piling them one above the other is, (g = 10ms–2)
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a
20 J
b
2 J
c
19 J
d
10 J
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Correct option is C
d1 = Displacement of C.G. of block -1 = l, where l = length of side. d2 = 2l, d3 = 3l,....d19 = 19l W = mgd1 + mgd2 + ......+mgd19 = mgl (1+2+3+....19) = 190 x 0.1 x 10 x 0.1J= 19JSimilar Questions
A simple pendulum is swinging in a vertical plane. The ratio of its potential energies when it is making angles and with the vertical is,
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