A25-cm-diameter stainless steel ball (rho = 8055 kg/m3, cp = 480 j/kg·°c) is removed from the oven at a uniform temperature of 300 °c. the ball is then subjected to the flow of air at 1 atm pressure and 25 °c with a velocity of 3 m/s. the surface temperature of the ball eventually drops to 200 °c. determine the average convection heat transfer coefficient during this cooling process. estimate the average rate of heat transfer.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?