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Physics-

General

Easy

Question

A body floats in a liquid contained in a beaker, the whole system as shown falls freely under gravity. The up thrust on the body is

Zero
Equal to the weight of liquid displaced
Equal to the weight of body in air
Equal to the weight of immersed portion of body.

The correct answer is: Zero

In a freely falling body, (system) $g subscript e f f end subscript equals 0$
and up thrust = V_ir_Lg_eff
Where {V_i = immersed volume r_L= density of liquid}
Hence up thrust = V_ir_L 0
=0

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