An aluminum tube (outer diameter = 120 mm, inner diameter = 110 mm, Galuminum = 28 GPa) and a copper tube (outer diameter = 50 mm, inner diameter = 40 mm, Gcopper = 40 GPa) are securely fastened to two rigid bars in end B and fixed in end A. The length of the two tubes is 1.4 m. A torque of 8 kN·m is applied at section B. Determine (a) the maximum torsional shear stresses developed in the aluminum and copper tubes, respectively, and (b) the angle of twist at section B.

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.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented