Anitrogen turbine, designed to deliver a power output of 15,000 btu/hr, operates with inlet conditions of 120 psia and 80 °f, and discharges nitrogen at a low pressure of 40 psia. assuming a turbine efficiency of 0.75, determine the temperature of the nitrogen at its discharge and the required mass flow rate of the nitrogen.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?