A cork is submerged in water by a spring attached to bottom of a pail. When pail is kept in a elevat

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9-1.Fluid Mechanics

medium

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

Solution

(b) Density of cork $= d$, Density of water $= \rho$

Resultant upward force on cork $ = V(\rho – d)\,g$

This causes elongation in the spring. When the lift moves down with acceleration a, the resultant upward force on cork $ = V(\rho – d)(g – a)$ which is less than the previous value. So the elongation decreases.

Standard 11

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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

Solution

Similar Questions

Why is it easier to swim in sea water than in river water ?

Two solids $A$ and $ B$ float in water. It is observed that $A$ floats with half its volume immersed and $B$ floats with $2/3$ of its volume immersed. Compare the densities of $A$ and $B$

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