A block is floating in a liquid as shown in figure. Suppose 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 $w^{1}$ , $P^{1}$ and $F^{1}$ then

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$F^{1} - w^{1} = 0$

$P^{l} > P$

$F^{l} > F$

$w^{1} > w$

answer is B, C.

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Detailed Solution

$P^{1} = P_{0} + ρgh + ρah but P = P_{0} + ρgh$

$\Rightarrow P^{1} > P$

$w = w^{1}$

In an accelerated container, weight remains unchanged while pressure and upthrust increases. The equation of block in new situation becomes,

$P - w = ma$

Here, m is mass of block and a its acceleration.

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