First slide

Fluid statics

Question

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

Moderate

A

Zero
B

Equal to the weight of liquid displaced
C

Equal to the weight of the body in air
D

None of these

Solution

Up thrust on the body = $v σ g$ . For freely falling, body effective g becomes zero.
So up thrust becomes zero.

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