The atmospheric pressure at sea level is 760mm of mercury. At what height it will be 740mm of mercury? Take the density of air 1.293kg/m3 constant upto height about 1 km.
Given,
Weight of the girl = 50 kg = 490 N
Circular diameter of the heel = 1.0 cm = 10-2 m
Area of the heel is given by,
Threfore, the pressure exerted by the heel on the ground is given by,
The pressure due to height column, P = ρgh
If the pressure due to height column of different liquids is same, then the relation between the height coulumn is given by,
,
is the required height of the water column which will produce the same pressure as 50 cm of Hg column.