A block is floating in a liquid as shown in figure, Support $w =$ weight of block $P =$ pressure at bottom of block and $F =$ upthrust on the block. Now suppose container starts moving upward with some positive acceleration. The new values are suppose $w^{'}, P$ and $F$ . Then:

w^{'} > w

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P^{'} > P

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F^{'} > F

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F^{'} - w^{'} = 0

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Solution

The correct options are
B $P^{'} > P$
C $F^{'} > F$
Now weight does not change it remains $w = w^{'}$
Earlier the pressure $P = P_{0} + h ρ g h$
Now pressure is $P^{'} = P_{0} + ρ g h + ρ a h$
So, $P^{'} > P$
As downward pressure increases the upthrust will also increases. So, $F^{'} > F$
The correct answers: $B, C$

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