First slide

Fluid statics

Question

A cork is submerged in water by a spring attached to the bottom of a pail. When the pail is kept in an elevator moving with acceleration downwards. The length of spring:

Easy

A

increases
B

decreases
C

remains unchanged
D

none of these

Solution

Buoyancy on the block causes the elongation in the length of the spring, when lift moves downwards with an acceleration buoyancy will be reduced and hence length of the spring will be decreased.

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