Sheet 01 Thrust, Pressure & Pressure Of Fluid and Measurement of Pressure.
The mass of brick is \(5kg\) and its dimensions are \(20\,cm\times10\,cm\times5\,cm\). Find; the pressure exerted on the ground when it is placed on the ground with difference faces. Take: \(g=9.8\frac{m}{s^{-2}}\).
Ans:(i) \(P_{1}=\left(9.8\times10^{3}\right)Pa\), (ii) \(P_{2}=\left(4.9\times10^{3}\right)Pa\) and (iii) \(P_{3}=\left(2.45\times10^{3}\right)Pa\).
The two thigh bones (femurs), each of cross-sectional area \(10\,cm^{2}\) supports the upper part of a human body of mass \(40kg\). Estimate the average pressure sustained by the femurs. Take: \(g=10\frac{m}{s^{2}}\).
A swimming pool of width \(11.0\,m\) and length \(24.0\,m\) is filled with water to a depth of \(4.0m\). Calculate: pressure on the bottom of the pool due to the water. given: the density of the water contained in pool is \(1000\frac{kg}{m^{3}}\) and acceleration due to gravity \(g=10\frac{m}{s^{2}}\).
Ans: \(P=\left(4\times10^{4}\right)Pa\).
The pressure of a gas contained in a cylinder with a movable piston is \(750\,Pa\). The area of the piston is \(0.5\,m^{2}\). Calculate: The force that is exerted on the piston.
Ans: \(F=375\,N\).
The pressure of a block of wood on ground is one atm. The area of the block is \(0.4\,m^{2}\). Calculate: the force that is exerted on the block. Take: \(1\,atm=100\,kPa\).
