First slide

Pressure in a fluid-mechanical properties of fluids

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

Moderate

A

Increases
B

Decreases
C

Remains unchanged
D

None of these

Solution

Effective weight $W' = m (g - a)$ which is less than actual weight mg, so the length of spring decreases.

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