Some damping systems use a disk immersed in oil as a damper. if the viscosity of the oil is µ, determine the torque, t, needed to be applied to the shaft to maintain the system rotating at a constant angular speed ω. express your answer in terms of the viscosity of the fluid, the angular speed of the system, the radius of the disk r, and the separation distance between the disk and the upper (a) and lower (b) horizontal walls of the damper. neglect the thickness of the disk.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.