Free convection occurs between concentric spheres. Theinner sphere is of diameter Diwitha volumetric heat generation rate of g, while the outer sphere is maintained at T0with a diameter of Do. Describe the procedures to find the inner sphere temperatureunder steady-state condition.

Consider a beam traveling through diamond and impinging upon the diamond-air interface. the critical angle of incidence for total internal reflection to occur is closest to the following value: select one: a)-22.50° b)-23.85 c)-24.30 d)-23.40° e)-none of the above

At steady state, air enters an insulated duct of varying cross-sectional area (similar to a nozzle or diffuser) at 200 kpa, 52°c with a mass flow rate of 0.5 kg/s. at the duct exit, the pressure of the air is 100 kpa, the velocity is 255 m/s, and the cross-sectional area is 2 x 10-3 m^2. assuming an ideal gas model, determine: a)-find the specific volume of the air at the exit, in m3/kg. b)- the temperature of the air at the exit, in k. c)-the velocity of the air at the inlet, in m/s. d)-the inlet cross-sectional area, in m^2.

The constant-pressure specific heat of air at 25°c is 1.005 kj/kg.°c. express this value in kj/kg k, jg c, kcalk.c, and btu/lbm °f.