115. Consider an ideal heat pump and a perfect electric heater. The electric heater converts 100% of the electrical energy into heat energy; the heat pump converts 100% of the electrical, energy into work, which then powers a Carnot refrigerator. Which is the more "efficient" way to heat a "home? (Ignore maintenance or start-up costs.)

Q: 6. For each of the three heat engines described, state whether it violates the First Law of…

A: Temperature of hot reservoir = 600 k Temprature of cold reservoir = 300 k

Q: 4.A ideal heat engine runs between a hot reservoir at 527 C and a cold reservoir at 27 C. 1. Make a…

A:

Q: engine does 12 kJ of work and 7.50 kJ of heat transfer occurs to the environment in a cyclical pro

A: Givenwork. W=12 kJHeat transfer to environment, Q1=7.5 kJ

Q: 1. A coal-fired power plant produces 9.00 × 1013 J of electrical energy in one day, and operates…

A:

Q: A heat engine exhausts 3 200 J of waste heat while performing 1 500 J of useful net work. What is…

A: Second law of thermodynamics

Q: 9. A neatly arranged bookshelf is very orderly system and has low entropy why is it safe to assume…

A: Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing…

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

A: Given data M=70 kgt=30 minE=1000 J/sec

Q: 4) The turbines at a coal-powered power plant were just upgraded, resulting in an improvement in…

A: increase in efficiency = 3.32 % Heat transferred into the heat engine in one day = 2.25×1014 J

Q: 1. What is the best coefficient of performance possible for a hypothetical refrigerator that could…

A: Given: The temperature of the cold reservoir is -190oC. The temperature of the hot reservoir is…

Q: 1. A heat engine with an efficiency of 35% does 600 J of work in each cycle. How much heat must be…

A: Given values: Efficiency of heat engine in percentage, η=35 % Work, W=600 J

Q: 12. Which, of the following temperature changes, would show the smallest change in entropy for a pan…

A: We can calculate change in entropy using  , ∆s = Cp x lnT2T1  Since Cp is common in all, the change…

Q: . You find yourself in the middle of a blackout with no electricity. You want to have a cup of tea,…

A: volume of water (V) = 200 cm3density of water = 1 gcm3∆h = 32 cm = 0.32 m Initial temperature of…

Q: 3. A heat engine does not convert all of the heat that flows through it into mechanical energy.…

A: According conservation of energy, energy can not be created not be destroyed.

Q: How does the first law of thermodynamics apply to systems that are not isolated?

A:

Q: 21. A heat engine would violate the second law of thermodynamics if it * O A. changed all the heat…

A: For a heat engine , it  must reject some of the heat it receives from the high-temperature source to…