34. A coal power station functions at 40.0 percent efficiency. What is the amount of work it does if it takes in 1.20x10¹² J by heat? O 3x10¹⁰ J ○ 4.8x10¹¹ J O 3x10¹2 J ○ 4.8x10¹2 J
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- (a) How much food energy will a man metabolize in the process of doing 35.0 kJ of work with an efficiency of 5.00%? (b) How much heal transfer occurs to the environment to keep his temperature constant? Explicitly show how you follow the steps in the Problem—Solving Strategy for thermodynamics found in Problem-Solving Strategies for Thermodynamics.This problem compares the energy output and heat transfer to the environment by two different types of nuclear power stationsone with the normal efficiency of 34.0%, and another with an improved efficiency of 40.0%. Suppose both have the same heat transfer into the engine in one day. 2.501014J. (a) How much more electrical energy is produced by the more efficient power station? (b) How much less heat transfer occurs to the environment by the more efficient power station? (One type of more ef?cient nuclear power station, the gas—cooled reactor, has not been reliable enough to be economically feasible in spite of its greater eficiency.)1. A certain power plant produces useful work (i.e. electricity) at a rate of 900 MW (remember, that's 900 x 106 joules/sec). How many joules of electricity does this power plant produce in 24 hours?
- 11. A coal-fired power plant produces 9.00 × 1013 J of electrical energy in one day, and operates with an efficiency of 35.0%. (a) How much heat is generated by burning coal at this power plant in one day? (b) How much waste heat is released into the environment (the cold reservoir) in one day? (c) Heat is delivered from the burning coal at a temperature of 480◦C and waste heat is dumped into the environment at a temperature of 30◦C. What is the Carnot efficiency, i.e. the highest efficiency allowed by the Second Law of Thermodynamics, of a heat engine operating between these two temperatures?A certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant is W = 0.26QH, where QH is the energy input as heat from the hot reservoir. a. If the power plant operates for a full day at its rated capacity, how much energy QH in MJ is needed? b. 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? c. How many tons nC of this coal is exhausted as wasted heat to QC in a single day?4. A heat engine operates between energy reservoirs of 75°C and 450°C. What is the maximum efficiency of this heat engine? Express your answer as a decimal, between 0 and 1. 5. A heat engine is operated between two energy reservoirs at different temperatures, where 10,200[J] of thermal energy flows out of the hot reservoir. If the engine has an efficiency of 0.15, what is the work performed by the engine? Express your answer in Joules.
- A typical coal-fired power plant burns 340 metric tons of coal every hour to generate 2.5 × 106 MJ of energy. One metric ton has a mass of 1000 kg and a metric ton of coal has a volume of 1.5 m^3. The heat of combustion is 28 MJ/kg. What is the power plant’s efficiency?600 J of work are done on a system in a process that decreases the system's thermal energy by 400 J. Match the answers with questions. v W- work done on the system A. 400 J v Q- Heat into or out of the system B. -200 J v AEth - Change in thermal energy of the system C. 1000 J D. -400 J E. -1000 J F. -600 J G. 200 J H. O J 1. 600 J1. What is the efficiency of a steam engine if it absorbed an energy of 2.5 x 10$ J from the boiler and gives up 1.5 x 10ºJ in exhausting during one cycle? Solution: Answer:
- 4. Suppose that a nuclear power plant has an efficiency of about 0.34, and generates 1000 MW of power. It is located on the banks of a major river that is 67 m wide near the plant, approximately 3 m deep, and flows at a rate of 0.5 m/s. Suppose that the plant re-routes all of this water into the plant and dumps its waste heat evenly throughout the water, then returns the warmer water to the river. How much warmer is the river downstream of the plant compared to upstream? Water's specific heat is approximately 4184 J/kg/K, and its density is 1000 kg/m³. [Answer: The water is warmer by 4.62 K. This is a lot warmer!]please answer the following As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work. What is the engine's efficiency (in percent)? The burning gasoline has a temperature of about 4,300°F (2,600 K). The waste heat from the engine flows into air at about 88°F (304 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?A light bulb has 75% efficiency. How much energy is wasted if the useful output energy of the bulb is 24 J? is the answer... a. 6.0 J b. 8.0 J c. 18 J d. 32 J e. 51J