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A 2.1-m long, 0.2-cm diameter electrical wire extends across a room that is maintained at 200C. Heat is generated in the wire as a result of resistance heating, and the surface temperature of the wire is measured to be 1800C in steady operation. Also, the voltage drop and electric current through the wire are 110 V and 3 A, respectively. Disregarding any heat transfer by radiation; determine the convection heat transfer coefficient for heat transfer between the outer surfaces of the wire and the air in the room.
two moles of nitrogen are initially at 10 bar and 600 k state 1 in a horizontal pistoncylinder device. they are
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a 9 m3 tank has two sections separated by a membrane both of which contain nitrogen gas. the nitrogen in section a has
A Pitot-static probe connected to a water manometer is used to measure the velocity of air. If the de?ection (thevertical distance between the ?uid levels in the two arms) is 7.3 cm, determine the air velocity. Take the density of air to be 1.25 k..
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a 0.7-lb block rests on top of a 0.5-lb block supported by but not attached to a spring of constant 9 lbft. the upper
wind turbines are becoming more and more common as a method of energy production wind turbines by their very nature are
design of a vacuum distillation plant for purification of glycerin by-product from a biodiesel plant.
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