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A flat plate solar collector, 6 ft by 12 ft, is mounted on the roof of a house. The outer surface of the collector is at 110oF and its emissivity is 0.9. The outside air is at 70oF and the sky has an effective temperature for radiation of 45oF. The collector transfers heat by natural convection to the air with a heat transfer coefficient of 3.2 Btu/h.ft2.oF and also transfers heat by radiation to the sky. Calculate the total heat loss from the solar collector.
a rigid tank contains 20 lbm of air at 20 psia and 70degf. more air is added to thenbsptank until the pressure and
a child drops a rock into a well and hears it splash into the water at the bottom exactly 2 seconds later. if she is at
a helicopter is ascending vertically with a speed of 5.78. at a height of 121 above the earth a package is dropped
Calculate the concentration (in weight percent) of molybdenum that must be added to tungsten to yield an alloy that contains 1.51 x 1022 Mo atoms per cubic centimeter.
an air conditioner in the airport of timbuktu runs a cooling system using r-410a with a high pressure of 1500 kpa and a
an electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive
Calculating the heat transfer rate and the rate that entropy is produced in a gear box. A gearbox operating under steady state conditions recieves 24 hp along the input shaft and delivers 10hp along the output shaft
a simple u-tube manometer is installed across an orifice meter. the manometer is filled with mercuryspecific gravity
question 1. a mild steel bar 40 mm diameter and 100 mm long is subjected to a tensile force along its axis.youngs
minimum weight design of a variable shape three-bar truss.numerical solution using the matlab optimization toolbox
Describing realistic applications of mechanical control systems - Feedback Control System Design and implement the controller using mechanical components or its electronic analog.
a steam turbine receives water at 15 mpa 600oc at a rate of 100 kgs shown in figure q4 below. in the middle section 20
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