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Dry air at 32degreeC flows over a wetted (water) plate of 0.2 m2 area. The average convection coefficient is h = 20 W/m2 middot K, and the heater power required to maintain the plate at a temperature of 27degreeC is 432 W. Estimate the power required to maintain the wetted plate at a temperature of 37degreeC in dry air at 32degreeC if the convection coefficients remain unchanged.
a rigid tank contains 7.5 kg of saturated water mixture at 400 kpa. a valve at the bottom of the tank is now opened and
design 2-shell pass and 8-tube pass heat exchanger for heating ethyl alcohol from 25degc to 70degc at a rate of 2.9
the two blocks in the figureoscillate on a frictionless surface with a period of 1.7 s. the upper block just begins to
Hollow shaft transmitting power with shear limits. Design a hollow steel shaft to transmit 300 hp at 75 rpm without exceeding a shear tress of 8000 psi. Use 1.2:1 as the ratio of the outside diameter to the inside diameter.
Whats are examples of destructive tests and non destructive
a 1-kg disk slides on a smooth horizontal table and is attached to a string that passes through a hole in the table.a
Determine the COP of the heat pump that applies energy to a house at a rate of 4500kj/h for each kW of electric power it draws. Also, determine the rate of the energy absorption from the outdoor air.
an automobile tire with a volume of 0.5m3 is inflated to a gage pressure of 200 kpa. calculate the mass of air in the
two forces f1 and f2 with magnitudes 40 and 55 newtons respectively act on an object at the origin. the angle f1 makes
a homogeneous cylinder with weight g and radius r lay on a roughnbsphorizontal floor and adjoins to a rough vertical
water at 200 kpa and 10 degree celcius enters a mixing chamber at a rate of 150 kgmin where it is mixed steadily with
an especially violent lightning bolt has an average current of 1.37 103 a lasting 0.125 s. how much charge is delivered
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