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Coefficient of Viscosity

A cork is sub...

Question

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

A

Increases

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B

Decreases

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C

Remains unchanges

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D

None of these

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Solution

The correct option is C Decreases
Due to acceleration in the Downward direction the final thrust will decrease from $ρ_{w} V g$ to $ρ_{w} V (g - a)$ so the spring will go in compression and the length of the spring will decrease.

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