A Carnot engine operates between reservoirs at 550K and 300K, discarding 1500 J of heat in each cycle. (a) What is the engine's efficiency? (b) How much heat is supplied to the engine by the hot reservoir in each cycle?
What will be an ideal response?
Answer: (a) 45.5% (b) 2750 J
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Indicate whether the statement is true or false
The temperature coefficient of resistivity of iron is 5.0 × 10^-3 / °C; that of carbon is -0.50 × 10^-3 / °C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20°C, are cooled from that temperature to -80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
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A ten-loop coil having an area of 0.23 m2 and a very large resistance is in a 0.047-T uniform magnetic field oriented so that the maximum flux goes through the coil
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Discuss the discovery of Seyfert galaxies and their observable properties
What will be an ideal response?