Physics, 29.08.2019 21:00 cherokeesiouxw72
Ahot engine generates excess heat at a rate of 7200 j per second. it has a surface temperature of 400°c, while its surroundings are at 27°c. the engine has a surface area of 0.45 m^ 2 and an emissivity of 0.75. the engine also loses heat via a steel conduit of diameter 44 cm and length 25 cm. assuming the temperature of the engine is stable, at what rate is heat lost to the surrounding air via convection?
Answers: 2
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Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg
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Ahot engine generates excess heat at a rate of 7200 j per second. it has a surface temperature of 40...
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