Solution to problems – class 9 – Set 1 Q 53

Problem Statement

53)
Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g/cm^3.

Solution

(continuing with cgs system data)
Pressure of mercury column is hdg = 70 x 13.6 x g ……..(1)

let the height of water column = H cm


Pressure of water column = H x 1 x g …………..(2)

As per problem statement
H g = 70 x 13.6 x g
H = 70 x 13.6 = 952 cm = 9.52 m

Question Set – Physics Problems for grade 9

Solution to problems – class 9 – Set 1 Q 53
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