First slide

Fluid statics

Question

A body is floating in a liquid contained in a vessel.The whole system is falling under gravity.Upthrust on the body due to liquid is :

Easy

A

equal to weight of liquid displaced
B

equal to weight of body in air
C

equal to half the weight of object in air
D

zero

Solution

Thrust = $v_{i n} ρ_{l} g$
when the lift falls freely effective acceleration due to gravity will be zero.

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