Physics Numerical for class 9 motion & other chapters with answers & [PDF]

Last updated on December 12th, 2023 at 01:53 pm

Problems based on Pressure and Thrust

49) A hammer exerts a force of 1·5 N on each of the two nails A and B. The area of the cross-section of the tip of nail A is 2 mm^2 while that of nail B is 6 mm^2. Calculate the pressure on each nail in Pascal.

Solution: solution Q49

50) A block of iron of mass 7·5 kg and of dimensions 12 cm x 8 cm x 10 cm is kept on a tabletop on its base of side 12 cm x 8 cm. Calculate (a) thrust and (b) pressure exerted on the tabletop. Take 1 kgf=10 N.

Solution: solution Q50

51) A vessel contains water up to a height of 1·5 m. Taking the density of water 1()^3 kg /m^3, acceleration due to gravity 9·8 m/ S^2, and area of the base of vessel 100 cm^2, calculate: (a) the pressure and (b) the thrust, at the base of the vessel.

Solution: solution Q51

52) The area of the base of a cylindrical vessel is 300 cm^2. Water (density = 1000 kg /m^3) is poured into it up to a depth of 6 cm. Calculate (a) the pressure and (b) the thrust of water on the base. (g = 10 m/ s^2).

Solution: solution Q52

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

Solution: solution Q53