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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Jan 2008 13:30:51 IST
Accepted Answer [?]
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2.
since temperature remains constant
PV=constant
initial pressure = 75 cm Hg
initial volume = 100A
A-area
let the length of cylinder containing gas be h
then final volume = Ah
final pressure = ( 75 + 100-h)
where 100-h is the height occupied by mercury
75 x 100 = h(175-h)
solve the quadratic
the two solutions are h= 100 and h = 75
h= 100 is not possible
therefore h=75
height of mercury = 100-75 = 25cm
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