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.
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.