The power output of a car engine running at 2300 rpmrpm is 300 kW . (a) How much work is done per cycle if the engine's thermal efficiency is 40.0 %?Give your answer in kJ.  Win =7.83kJ (b)How much heat is exhausted per cycle if the engine's thermal efficiency is 40.0 %?Give your answer in kJ.

A particular power plant operates with a heat-source reservoir at 350°C and a heatsink reservoir at 30°C. It has a thermal efficiency equal to 55% of the Carnot-engine thermal efficiency for the same temperatures. What is the thermal efficiency of the plant? To what temperature must the heat-source reservoir be raised to increase the thermal efficiency of the plant to 35%? Again, η is 55% of the Carnot-engine value

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?

An engine has a hot-reservoir temperature of 980 K and a cold-reservoir temperature of 550 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?

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

A Carnot heat engine operates between thermal reservoirs at Th and Tc. What is the theoretical efficiency, η, of this engine?  Part (a)  Write an expression for thermal efficiency, η.   Part (b)  Solve numerically for the thermal efficiency, η, assuming that Th = 910°C and Tc = 310°C.

A heat pump has a coefficient of performance equal to 4.05 and requires a power of 1.61 kW to operate. (a) How much energy does the heat pump add to a home in one hour? J (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance? Need Help? Read It

A certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant is W = 0.21QH, where QH is the energy input as heat from the hot reservoir. a) Which would increase the efficiency more, doubling QH or reducing QC by half?  b) Calculate the maximum thermal efficiency of the power plant.  c) Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant.  d) If the power plant operates for a full day at its rated capacity, how much energy QH in MJ is needed?  e) If, on average, one ton of coal contains Q = 25 GJ of energy, how many tons nH of coal would the plant need to operate for a day at its rated capacity?  f) How many tons nC of this coal is exhausted as wasted heat to QC in a single day?