A wooden block with a coin placed on its top, floats in water as shown in figure:

The distance l and h are shown in the figure. After some time the coin falls into the water. Then

a) l decreases

b) h decreases

c) l increases

d) h increases

Answers (1)

The answer is the option (a) and (b)

The amount of displaced fluid is equal to the weight of the floating body; this is as per the floatation principle. When the coin is dropped, the net force acting on the block decreases as the coin displaces water in an equivalent amount to its weight. This is the reason that the block rises up. As the block rises, l decreases. The height h will also decrease as the amount of water getting displaced now will be lesser. Hence option a and b are correct.

 

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