Suppose a fluid whose coefficient of viscosity is η and density ρ, flows through a cylindrical tube of radius r and length L. Let P be the pressure difference in the liquid at both ends of the tube. If the volume of the liquid flowiing per unit time through the cylindrical tube depends on the pressure gradient P/L, the coefficient of viscosity η and radius r, obtain an expression for the volume of liquid flowing per unit time through the tube. ​

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.