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?

86. D A lawnmower engine with an efficiency of 0.22 rejects 9900 J of heat every second. What is the magnitude of the work that the engine does in one second?

A 39% maximum efficient coal-fired power plant needs to produce 600 MW of power.  A. To achieve maximum efficiency, if the waste water is dumped into a 13 degree Celsius lake, what temperature must the steam be heated to?  B. Since coal contains 27 kJ of energy per gram, how many kg of coal must be burned in a day?

Can you help 2a and subpart 2b  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?   2a. To generate this amount of electricity, the power plant uses 2.22 x 1014 J of heat drawn from burning coal. What is the efficiency of this power plant?    2b. How much waste heat, Qc, does this power plant eject into its cold reservoir in 24 hours

A certain heat engine does 12.0 kJ of work and 8.50 kJ heat transfer occurs to the environment in a cyclical process.   a. What was the heat transfer (in kJ) into this engine?   b. What was the engine's efficiency (in percent)?

An aircraft engine takes in 8900 JJ of heat and discards 6700 JJ each cycle. Part A. What is the mechanical work output of the engine during one cycle?   Part B. What is the thermal efficiency of the engine? Express your answer as a percentage.

m = 0.593 kg of methanol in atmospheric pressure is heated with an electric heater from T₁ = 30.2 °C to its boiling point. After the heating my methanol is vaporized. Heating and vaporizing takes t = 450.41 s with n=0.59 heater's efficiency. What is the volume of methanol? V = What is the energy required for heating? E₁ = 1 kJ m³ Your last answer was interpreted as follows: 1 What is the energy required for vaporizing? Ev = 1 kJ Your last answer was interpreted as follows: 1 What is the power of the heater? P = 1 с Your last answer was interpreted as follows: 1 Your last answer was interpreted as follows: 1 What is the electr. energy needed for heating and vaporizing? Eε = 1 kJ Your last answer was interpreted as follows: 1 h Do not leave any fields blank. If you don't know the answer, insert 1 for example. Insert the answer with 3 significant digits without rounding the answer. Constant P Tb Value Unit 2.53 1165 786.3 64.7 °C umges Quantity heat capacity kg K kJ kW kg kg LAN Symbol h…

A crate of fruit with a mass of 40.0 kg and a specific heat capacity of 3550 J/(kg. K) slides 9.00 m down a ramp inclined at an angle of 40.0 degrees below the horizontal. Part A If the crate was at rest at the top of the incline and has a speed of 2.55 m/s at the bottom, how much work Wf was done on the crate by friction? Use 9.81 m/s² for the acceleration due to gravity and express your answer in joules. ► View Available Hint(s) Wf = -2140 J Submit Correct The frictional force opposes the motion of the crate, so the work done on the crate by friction must be a negative quantity. Part B Previous Answers If an amount of heat equal to the magnitude of the work done by friction is absorbed by the crate of fruit and the fruit reaches a uniform final temperature, what is its temperature change AT? ► View Available Hint(s) AT = ΑΣΦ W

during a cycle, an engine draws 3.50 x 10^3 j of energy from a hot reservoir and releases 2.25 x 10^3 of energy to a cold reservoir. a. how much work does the engine do in one cycle   b. calculate the efficiency of the engine

A NATO base in northern Norway is warmed with a heat pump that uses 7.0°C ocean water as the cold reservoir. Heat extracted from the ocean water warms fluid to 80°C; this warmed fluid is used to heat the building. When the system is working at full capacity, 2000 kW of heat are delivered to the building at the cost of 600 kW of electrie energy. a. What is the actual coefficient of performance of the system? b. What is the theoretical maximum coefficient of performance of the system? а.