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

Question

A cork is submerged in water by a spring attached to the bottom of a pail. When the pail is kept in a elevator moving with an acceleration downwards, the spring length, Increases, Decreases, Remains unchanged, Data insufficient

MARKS App · Accepted Answer

Density of cork = d , Density of water = ρ Resultant upward force on cork = V ( ρ − d ) g This causes elongation in the spring. When the lift moves down with acceleration a , the resultant upward force on cork = V ( ρ − d ) ( g − a ) which is less than the previous value. So the elongation decreases.

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