An engine has a hot reservoir that contains 20,000 J of heat energy at 3270 C, and a cold reservoir that contains 12,000 J of heat energy at 270 C. What is the relative efficiency of this engine?

Calculate the maximum efficiency of an engine operating between 60 C° and 160 C°. 28% A 30% .B 23% .C 16% .D O

A Carnot refrigerator operates with an efficiency n = 0.66666666666667 between a hot reservoir at temperature T₁ = 50 K and a cold reservoir at temperature T2. Calculate the temperature T₂ of the cold reservoir. Select one: O a. T₁ O b. T₁ = 150.0 O d. T₁ = = 25.0 O c. T₁ 16.666666666667 = = 20.0

Problem 2:   This problem compares the energy output and heat transfer to the environment by two different types of nuclear power stations—one with the normal efficiency of 36 %, and another with an improved efficiency of 47 %. Suppose both have the same heat transfer into the engine in one day, 2.5 × 1014 J  Part (a)  How much more electrical energy is produced by the more efficient power station?  Part (b)  What is the change in the heat transfer to the environment after the upgrade to the more efficient power station?

A sealed cylinder has a piston and contains 8.90×103 cm3 of an ideal gas at a pressure of 7.50 atm. Heat is slowly introduced, and the gas isothermally expands to 1.70×104 cm3. How much work ? does the gas do on the piston?

A power plant uses natural gas energy to heat up steam. The steam at 400 deg C generates electric power, then is condensed, and the water is cooled to 30 deg C. The cycle repeats. The maximum possible efficiency of electricity generation is %.

You design an engine that takes in 1.50x104 J of heat at 650 K in each cycle and rejects heat at a temperature of 290 K. The engine completes 240 cycles in 1 minute. What is the theoretical maximum power output of your engine, in horsepower? 1 Watt = 1 Joule/s = 0.00134102 horsepower 44.5 hp 15.0 hp 6.50 hp 2.90 hp

The first law of thermodynamics, ΔU = Q - W, when written as Q = W + ΔU, says that the heat into a system can be used to do work and/or increase the internal energy. Therefore, which process requires the most heat? Isobaric, isochoric, or adiabatic?

Consider a heat pump that is used to cool down a home during the summer. Its coefficient of performance in cooling mode is 5.81. On a particularly hot day, the temperature outside the home is 90◦F, and the temperature inside the home is maintained at 70◦F. If the heat pump consumes 500 W of electrical power, at what rate does it remove heat (W) from the home?

When 1.60 x 105 J of heat transfer occurs into a meat pie initially at 20.0°C, its entropy increases by 475 J/K. What is its final temperature (in degrees)? 100.36 X °C