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- Can improved engineering and materials be employed in heat engines to reduce heat transfer into the environment? Can they eliminate heat transfer into the environment entirely?An ideal heat pump is being considered for use in heating an environment with a temperature of 22.0C. What is the cold reservoir temperature if the pump is to have a coefficient of performance of 12.0 ?A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (16°C) at the ocean's surface and cooler water (4°C) 1,247 m below the surface. What is the maximum possible efficiency of the system? 0.75 % Need Help? Read It Watch It
- To produce 96 hp of mechanical power, an automobile engine requires a supply of heat of 4.91 105 J per second from combustion of the fuel. What is the efficiency of this engine?A container holds 1.8 kg of ice at -15.0 degree C. (mass of the container can be ignored) Heat begins to be supplied to the container at a constant rate of 600 J/min. The specific heat of ice water is 2010 J/(kg K), and the latent heat of melting is 334000 J/kg. How many mins. until ice begins to melt? How many additional mins will it take until the ice has fully melted?27. This problem compares the energy output and heat transfer to the environment by two different types of nuclear power stations—one 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, 2.50×1014J . (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 efficient nuclear power station, the gas-cooled reactor, has not been reliable enough to be economically feasible in spite of its greater efficiency.)
- 42) During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle? B) 460 J C) 126J D) 712 J A) 586 J1.) A typical person has an average heart rate of 69.0 beats/min. Calculate the given questions. How many beats does she have in 7.0 years? How many beats in 7.00 years? And finally, how many beats in 7.000 years? Pay close attention to significant figures in this question. 2.The specific heat of a certain type of cooking oil is 1.75 cal/(g ·°C). How much heat energy is needed to raise the temperature of 2.75 kg of this oil from 23 ∘C to 191 ∘C? 3.) A 232 mL cup of whole milk contains about 27 mg of cholesterol. Express the cholesterol concentration of the milk in kilograms per cubic meter (kg/m3). 4.) Convert the volume to its equivalent in milliliters. 33.0uL=mL1.An electric kettle transfers 900 000 J of energy to some water in 10 minutes. (a) Estimate the power of the electric kettle. (b) How long does it take to supply 1 500 000 J of energy to heat some water? 2.Energy is measured in (a)__________________, written as J. 2. The energy transferred per unit time is called (b)__________________. Its SI unit is (c)__________________, written as W. 3. (d)_______________________ (kW h) is also a unit of energy which is more common in practical use. 1 kW h is equal to (e)_______________ J. 4 The electrical energy supplied to an electrical appliance can be measured using a (f)_______________________ (readings in J) or a (g)_______________________ (readings in kW h). 6.Heater A transfers 500 kJ of heat in 30 s while heater B transfers 0.8 MJ of heat in 0.75 min. Which heater transfers heat more quickly? Explain your answer with calculations.
- 4. With 2.56 × 10^6 J of heat transfer into an engine, it performs only 1.50 × 10^5 J of work. (a)What is the engine’s efficiency? (b) How much heat transfer to the environment takes place?An electrical power station uses 1.58 x 10-4 J of heat input with an efficiency of 35.7%. (a) How much work is done? (b) How much waste heat is produced by the station? (c) What is the ratio of waste heat to work output? waste heat work outputHeat is added to a 9.0 kg piece of ice at a rate of 529.0 kW. How long will it take for the ice at 0.0° C to melt? (For water Lf= 334 kJ/kg and Ly = 2257 kJ/kg.) A) 0.0s B) 3000s C) 5.7 s D) 1,600,000 s