A boy weighing 60 kgf is wearing shoes with heel or area or section 20 cm², while a girl weighing kgf wearing sandals with heel of area or cross section 1.5 cm². Compare the pressure exerted on ground by their heels when they stand on heel or one foot.

Calculate the pressure due to a water column of height 100 m. (Take g = 10 m s^-1 and density of water = 10³ kg m^-3).

At what depth below the surface of water will pressure be equal to twice the atmospheric pressure is 10 N cm^-2, density of water is 10³ kg m^-3 and g = 9.8 m s^-2.

A cube of each side 5 cm is placed inside a liquid. The pressure at the center of one face of cube is 10 Pa. Calculate the thrust exerted by the liquid on this face.

A square plate of side 10 m is placed horizontally 1 m below the surface of water. The atmospheric pressure is 1.013 x 10⁵ N m^-2. Calculate the total thrust on the plate.

(Density of water p = 10³ kg m^-3, g = 9.8 m s^-2)