A barometer kept in a stationary elevator reads $76 cm$. If the elevator starts accelerating up the reading will be
A barometer kept in a stationary elevator reads $76 cm$. If the elevator starts accelerating up the reading will be
- A
Zero
- B
Equal to $76 cm$
- C
More than $76 cm$
- D
Less than $76 cm$
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A $U-$tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with $10.0\; cm$ of water in one arm and $12.5\; cm $ of spirit in the other. if $15.0\; cm$ of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels (in $cm$) of mercury in the two arms?
(the specific gravity of spirit is $0.8.)$
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(the specific gravity of spirit is $0.8.)$
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