Physics, 02.12.2021 04:00 dreamadoreaa
An engine has an ideal efficiency of 37%, and the cold reservoir is 15°C. What is the temperature of the
hot reservoir? Convert the efficiency to a decimal before solving. Round the answer to the nearest
tenth.
457.1 K
O 301.47K
275.09K
498.78K
Answers: 3
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Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.
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Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)
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