Which one of the following gives the lift force FL produced on a rotating circular cylinder per unit length in a uniform flow ?
u = free stream velocity
ρ=density of the fluid
On stretching a wire of Young's modulus Y having original length L by an amount l using a force F, the elastic energy stored per unit volume is
A metal cylinder of length L is subjected to a uniform compressive force F as shown in the figure. The material of the cylinder has Young's modulus Y and Poisson’s ratio σ . The change in volume of the cylinder is