3. An oil is being pumped inside a 10.0mm diameter pipe at a Reynolds number of 2100 . The oil density is 855kg/m3 and the viscosity is 2.1102 Pa.s. a) What is the velocity in the pipe? b) It is desired to maintain the same Reynold Number of 2100 and the same velocity as in part (a) using a second fluid with a density of 925kg/m3 and a viscosity of 1.5102Pa.s. What pipe diameter should be used