Question

A 3.0-cm-diameter tube is held upright and filled to the top with mercury. The mercury pressure at the bottom of the tube − the pressure in excess of atmospheric pressure-is 60 kPa.

Answer 1

Solution:- We know that pressure = Weight/ Area

Weight =Mass*gravity and mass = Density*volume

=> Weight = Density*Area*Height*gravity

Now, Pressure = Weight/Area

=> Pressure = (Density*Area*Height*gravity)/(Area)

=> Pressure = Density*Height*Gravity

Given: Pressure = 60*10^3 Pa

=> (60*10^3)/(9.8 *13600) = Height

=> Height = 0.450 m = 45 cm. Answer.