A system does 2.6 × 108 J of work while 7.77 × 108 J of heat transfer occurs to the environment. What is the change in internal energy of the è system assuming no other changes (such as in temperature or by the addition of fuel)? J
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- Which of the following can effectively lower the internal energy of a room? A A fan B A refrigerator with its door left wide open C An air - conditioner partially exposed to the atmosphere D A refrigerator with its door closed 9.During the adiabatic expansion, the temperature of 0.1 mol of oxygen drops from 30C to 10C. a) How much work does the gas do? b) How much heat is added?A large electrical power station generates 1400 MW of electricity with an efficiency of 31 %. a) How much heat does the power station need to generate this amount of electricity in one day? Qn = b) How much heat is exhausted to the environment in one day? Qc = J c) The exhaust heat is transferred to the ambient air at 15 °C. What is the change in entropy of the surrounding air in one day? AS = J/K %3D d) The heat driving the generators is in the form of superheated steam at 260 °C. If a Carnot engine had been used instead, what would it's efficiency be? Efficiency = e) How much work was lost (left undone) because a Carnot engine was not used? WCarnot Wactual = %3D
- Consider a heat engine transferring energy from a warm region (Tw) to a cool region (Tc) . Which combination of temperatures will result in the highest efficiency? a. Tw = 500 K, Tc = 400 K b. Tw = 500 K, Tc = 300 K c. Tw = 500 K, Tc = 450 K d. Tw = 300 K, Tc = 300 K86. 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?1 Question 15 According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process: 4 O is independent of the heat input O equals the heat input plus the work done by the gas O is independent of the work done on the gas O equals the work done by the gas minus the heat input equals the heat input minus the work done by the gas
- Six grams of helium (molecular mass = 4.0 u) expand isothermally at 370 K and does 9600 J of work. Assuming that the helium is an ideal gas, determine the ratio of the final volume of the gas to the initial volume. Number i Units Save for Later Attempts: 0 of 1 used Submit Answerpart 1 of 2 A Carnot engine has a power output of 72 kW. The engine operates between two reservoirs at 20°C and 286°C. How much thermal energy is absorbed each hour? Answer in units of J. part 2 of 2 How much thermal energy is lost per hour? Answer in units of J. Y Yo iWhat is the theoretical maximum efficiency of a heat engine (Carnot engine) operating between 150.0 C and 400.0 C? O 0.3714 O 0.6250 O 0.3750 O 0.2500 O 0.3560
- Calculate the efficiency of a heat engine operating between two reservoirs at temperatures T₁ = 400 K and T₂ = 300 K. Select one: O a. η = 0.25 - Ο b. η = 3.0 O c. n = 4.0 O d. n = 0.33333333333333A gas expands from 2.2 L to 3.6 L against a constant external pressure of 1.6 atm. What is the work done? A. -227 J B. 227 J C. 2.24 J D. -2.24 JWhat is the change in internal energy of a system that takes in 4.53 x 106 ) of heat, and does 4.50 x 105 J of work while dissipating 8.67 x 106 J of heat?