Question

# A block of wood is kept on table top. The mass of wooden block is 5 kg and its dimensions are 40cm×20cm×10cm. Find the pressure exerted by the wooden block on the table top, if it is made to lie on the table top with its sides of dimensions (a) 20cm×10cm and (b) 40cm×20cm

A
(a) P=2440Nm2 (b) P=610.5Nm2
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B
(a) P=2450Nm2 (b) P=612.5Nm2
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C
(a) P=2460Nm2 (b) P=618.5Nm2
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D
(a) P=2470Nm2 (b) P=712.5Nm2
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Solution

## The correct option is A (a) P=2450Nm−2 (b) P=612.5Nm−2Mass of the wooden block, m=5kgThrust due to wooden block,Mg=5kg×9.8ms−2=49N(a) Surface area of 20cm×10cm surface,A=(20×10)cm2=(0.2×0.1)m2=0.02m2P=mgAP=49N0.02m2=490.02Nm−2or Pressure, P=2450Nm−2.(b) Surface area of 40cm×20cm surface,A=(40×20)cm2=(0.4×0.2)m2=0.08m2P=49N0.08m2=490.08Nm−2or Pressure, P=612.5Nm−2.

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