The steam supplied to an engine liberates 5000 J of heat. If the engine efficiency is only 40%, to what height a body of mass 10 kg can be lifted using the work output from the engine?
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A: Given :W= 5.4 x 108JH= 3.6 x 109J
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A: Change in Internal energy, ∆U=-1.6×105J Heat lost, Q=-4.0×104J
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A: Given : W = 1.97 x 1010 J e = 8.60% = 0.086
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A: (a) The engine's efficiency is η=work doneEnergy input×100%=3700 J18500 J×100%=20%
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- While walking you give off 4.0x10^5J of heat and your internal energy decreased by 6.0x10^5 J. How much work have you done while walking?A heat engine that 80% efficient exhausts 300 J of waste heat. How much work does the heat engine do?To produce 96 hp of mechanical power, an automobile engine requires a supply of heat of 4.91 105 J per second from combustion of the fuel. What is the efficiency of this engine?
- As a gasoline engine is running, the amount of gasoline containing 15,000J of chemical potential energy is burned in 1 s. During that second, the engine does 3,000J of work. The burning gasoline has a temperature of about 2500 K. The waste heat from the engine flows into the air at about 300 K. What is the Carnot efficiency of a heat engine operating between these two temperatures?A heat engine does 4.6 × 107 J of work when supplied 8.9 × 107 J. What is itsefficiency?8000 J of heat from a hot reservoir is put into a reversible (Carnot) heat engine whose hot and cold reservoirs are at 600 K and 150 K respectively. How much work does the engine do?
- A bathroom extractor fan being sold on Amazon has a duct diameter of 10.0 cm. It extracts air from a bathroom at a rate of 70.0 m3/h and the power supplied to the fan is 7.0 W. With what efficiency does the extractor convert electrical power into the kinetic power associated with the air-motion? Take the density of air to be 1.2 kg/m3 and assume laminar air flow.A heat engine does 8.1 × 107 J of work when supplied 10.9 × 107 J. What is itsefficiency?An engine takes in 600 J and exhausts 450 J each second is running. What is the engine's efficiency?