Two very long concentric cylinders of diameters d1 = 0.42 m and d2 = 0.5 m are maintained at uniform temperatures of t1 = 950 k and t2 = 500 k and have emissivities ε1 = 1 and ε2 = 0.55, respectively. determine the net rate of radiation heat transfer between the two cylinders per unit length of the cylinders. (use σ = 5.67 × 10-8)

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.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above