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Q.

A rectangular wooden block of dimensions 50 cm, 20 cm and 10 cm is with its larger surface in contact with a horizontal table. The amount of work done to keep the block with smaller surface in contact with the table is (dwood = 2000kg/m3, g=10 ms–2) 

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a

40 J

b

80 J

c

20 J

d

60 J

answer is B.

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Detailed Solution

Height of block initially= 5 cm

Height of block finally= 25 cm

Change in height= 20 cm

mass of block= 2000×50100×20100×10100= 20 Kg 

Change in pot energy = 20×10×0.2= 40 J

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