Q.

A body floats in a liquid contained in a beaker. The whole system as shown falls freely under gravity. The upthrust on the body due to the liquid is

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a

Zero

b

Equal to the weight of the liquid displaced

c

Equal to the weight of the body in air

d

Equal to the weight of the immersed position of the body

answer is A.

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Detailed Solution

Upthrust =Vρliquid(g−a)   where, a = downward acceleration,  V = volume of liquid displaced But for free fall a = g  ∴ Upthrust = 0
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A body floats in a liquid contained in a beaker. The whole system as shown falls freely under gravity. The upthrust on the body due to the liquid is