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Question Number 123336 by Lordose last updated on 25/Nov/20

  A mercury based barometer reads  760mmhg at the base of a mountain and  704.0mmhg at the top. Find the height   of the mountain if the density of   mercury and air are respectively  13600kgm^(−3)   and 1.25kgm^(−3)  (g=10ms^(−2) )

$$ \\ $$$$\mathrm{A}\:\mathrm{mercury}\:\mathrm{based}\:\mathrm{barometer}\:\mathrm{reads} \\ $$$$\mathrm{760mmhg}\:\mathrm{at}\:\mathrm{the}\:\mathrm{base}\:\mathrm{of}\:\mathrm{a}\:\mathrm{mountain}\:\mathrm{and} \\ $$$$\mathrm{704}.\mathrm{0mmhg}\:\mathrm{at}\:\mathrm{the}\:\mathrm{top}.\:\mathrm{Find}\:\mathrm{the}\:\mathrm{height}\: \\ $$$$\mathrm{of}\:\mathrm{the}\:\mathrm{mountain}\:\mathrm{if}\:\mathrm{the}\:\mathrm{density}\:\mathrm{of}\: \\ $$$$\mathrm{mercury}\:\mathrm{and}\:\mathrm{air}\:\mathrm{are}\:\mathrm{respectively} \\ $$$$\mathrm{13600kgm}^{−\mathrm{3}} \:\:\mathrm{and}\:\mathrm{1}.\mathrm{25kgm}^{−\mathrm{3}} \:\left(\mathrm{g}=\mathrm{10ms}^{−\mathrm{2}} \right) \\ $$

Answered by help last updated on 25/Nov/20

{pgh}_1 ={pgh}_2    13.6{76−70.4}=0.00125×h  h=??

$$\left\{{pgh}\right\}_{\mathrm{1}} =\left\{{pgh}\right\}_{\mathrm{2}} \: \\ $$$$\mathrm{13}.\mathrm{6}\left\{\mathrm{76}−\mathrm{70}.\mathrm{4}\right\}=\mathrm{0}.\mathrm{00125}×{h} \\ $$$${h}=?? \\ $$

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