A barometer kept in an elevator reads 76cm when it is at rest. If… - Vidyadip

Question

A barometer kept in an elevator reads 76cm when it is at rest. If the elevator goes up with increasing speed, the reading will be:

zero.
76cm.
< 76cm.
> 76cm.

✓

Answer

< 76cm.

Explanation:

If the elevator goes up at an increasing speed, then the effective value of g increases.

We know:

P = ρgh.

So, h will have a lesser value for the same value of P if g increases.

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