JEE Main Physics question
An engine pump is used to pump a liquid of density ρ continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is
Answer: (A)
Solution
The mass flow rate is ρAv. The rate of KE delivered = ½(mass flow rate)v² = ½(ρAv)v² = ½Aρv³. ## Elastic and Inelastic Collision