II, ITEAT, WORK, AND ENERGY 1. What is the elliciency of a gasoline engine that receives 2051 ofenergy from combustion and lose 150J by heat to exhaust during one cycle?
Q: Find the value of work done is 520 J and displacement is 42 m. Find the force applied ?
A: Given , Work done (W) = 520 J displacement (d) 42 m
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- 1. The formula for work in thermodynamics is given by PV = W. Suppose that at any pressure, P = h(V + V,") where V is the volume and V, is the initial volume. h and V, are constants. If work is to be maximized, what is the correct expression of maximum work in terms of constants? A. -1/2V. B. -h/2V. C. A(V, + 1)/4V, D. -h/4 E. None of these. A B.Suppose a woman does 650 J of work and 9300 J of heat is transferred from her into the environment in the process. a. What is the change in her internal energy, in joules, assuming she does not consume any food? b. What is her percent efficiency?8. A heat engine with an efficiency of 40% takesin 600 J of heat from the high-temperaturereservoir in each cycle.a. How much work does the engine do in eachcycle?b. How much heat is released to the low temperature reservoir?
- An engine does 10 J of work and exhausts 15 J of waste heat.a. What is the engine’s efficiency?b. If the cold-reservoir temperature is 20°C, what is the minimum possible temperature in °C of the hot reservoir?An engine has an electric generator that operates between 1870°C and 430°C. a. What is its maximum theoretical efficiency? b. Suppose that its actual efficiency is 42%. How much mechanical power does the engine deliver if it absorbs 140000 J of energy each second from the hot reservoir.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)?
- Q1. A Carnot's engine is operated between two reservoirs at temperatures of 450 K and 350 K. If the engine receives 1000 Calories of heat from the source in each cycle, calculate the amount of heat in Joules rejected to the sink in each cycle. Calculate efficiency of the engine and the work done in each cycle. (1 calorie = 4.2 Joules).A hot reservoir at 1700C transfers 400 kJ of heat to a cold resevoir at 500 C. What is the total change in entropy? a. 1,210 J/K b. 335 J/K c. 5,560 J/K d. 130 J/K e. 0.000 J/Kan engine receives 690 j of heat from a hot reservoir and gives off 430 j of heat to a cold reservoir. a. what is the work done by the engine ? b. what is the efficiency of the engine ?
- Suppose a certain heat engine has an efficiency of 25%. In order for this heat engine to do 450 J of useful work, how much energy flows out at the the cool- temperature reservoir? O a. 2,250 J O b. 1,350 J O c. 113 J d. None of these choices. O e. 1,800 J1. A certain heat engine does 11 kJ of work and 10 kJ of heat transfer occurs to the environment in a cyclical process. 1. What is the change in internal energy? AEint = kJ 2. What was the heat transfer into this engine? QH= ✔ KJ 3. What was the engine's efficiency? Efficiency = ✓84 J of heat energy are transferred out of an ideal gas and 35 J of work is done on the gas. What is the change in thermal energy, in Joules? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.