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Question

# A bucket of water contains a wooden block floating in water with (4/5)th of its volume sub merged in the water. The bucket is placed on the floor of a lift and the lift now starts moving down with uniform acceleration. The block of wood now:

A
moves upward.
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B
moves downward.
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C
remains at same place.
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D
moves horizontally.
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Solution

## The correct option is B remains at same place.ρsVg=ρw(45V)g⇒ρs=45ρwIf effective gravity is changed to g - a; ρsV(g−a)=ρw(xV)(g−a)⇒x=45So, 4/5 th volume of the block is still submerged, thus the block does not move.

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