*70. D The wattage of a commercial ice maker is 225 W and is the rate at which it does work. The ice maker operates just like a refrigerator or an air conditioner and has a coefficient of performance of 3.60. The water going into the unit has a temperature of 15.0 °C, and the ice maker produces ice cubes at 0.0 °C. Ignoring the work needed to keep stored ice from melting, find the maximum amount (in kg) of ice that the unit can produce in one day of continuous operation.

*70. D The wattage of a commercial ice maker is 225 W and is the rate at which it does work. The ice maker operates just like a refrigerator or an air conditioner and has a coefficient of performance of 3.60. The water going into the unit has a temperature of 15.0 °C, and the ice maker produces ice cubes at 0.0 °C. Ignoring the work needed to keep stored ice from melting, find the maximum amount (in kg) of ice that the unit can produce in one day of continuous operation.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

1
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?
Each second, a nuclear power plant generates 2000 MJ of thermal energy from nuclear reactions in the reactor’s core. This energy is used to boil water and produce high-pressure steam at 300°C. The steam spins a turbine, which produces 700 MJ of electric power, then the steam is condensed and the water is cooled to 30°C before starting the cycle again.a. What is the maximum possible efficiency of the plant?b. What is the plant’s actual efficiency?
E14 An engineer designs a heat engine using flat-plate solar collectors. The collector deliver heat at 72°C and the engine releases heat to the surroundings at 33°C. What is the maximum possible efficiency of this engine?
A furnace supplies 36.0 kW of thermal power at 230 °C to an engine that exhausts waste energy at 20.0°C. At the very best, how much work W can the system do per second? W = J
A sample of ideal gas in a thermally insulated container with a movable piston is initially in state A. The gas is taken from state A to state B by an adiabatic process. The dashed lines represent isotherms. If W is the work done on the gas, Q is the energy transferred to the gas by heating, and Delta U be the change in the internal energy of the gas during the process. a. If the temperature of the gas in state A is 200 K, what is the temperature of the gas in state B? b) Briefly explain how the answer to a is consistent to your answer to "is greater than zero, zero, or less than zero?"
If a heat engine performs 200J or work while absorbing 1000 of heat energy from the hot reservoir, what is the efficiency of this engine? A. 20% В. 80% С. 25% D. 50% E. 100%
We’ve seen that the area under a pV graph is the work done in an ideal-gas process. If the process follows a closed curve, the work is the area inside the curve. The graph as shown the gauge pressure in the lungs versus the volume of gas in the lungs for a person who is taking rapid, deep breaths. During one complete breath, the pressure-versus-volume data trace out the curve shown, in the direction of the arrows. The energy expended in one complete breath is represented by the shaded area inside the curve. If you graph pressure-versus-volume data for normal breathing, the upper and lower lines are much closer together and the volume range is much smaller. For one cycle of normal breathing, we expect the energy expended to be for the cycle illustrated in the figure.A. more than B. the same as C. less than
5. A Carnot refrigerator runs between a cold reservoir at temperature Tc and a hot reservoir at temperature Tµ. You want to increase its coefficient of performance. Of the following, which change results in the greatest increase in the coefficient? The value of AT is the same for all changes. a. Raise the temperature of the hot reservoir by AT b. Raise the temperature of the cold reservoir by AT c. Lower the temperature of the hot reservoir by AT d. Lower the temperature of the cold reservoir by AT
13. The temperatures To of the cold reservoirs and the temperatures T, of the hot reservoirs for four Carnot heat engines are engine 1: Tc = 400K and T₁ = 500K engine 2: T = 500K and T₁ = 600K engine 3: Tc = 400K and T₁ = 600K engine 4: Tc = 600K and TH = 800K Rank these engines according to their efficiencies, least to greatest. A. 1, 2, 3, 4 B. 1 and 2 tie, then 3 and 4 tie C. 2, 1, 3, 4 D. 1, 2, 4, 3 E. 2, 1, 4, 3
A heat engine operating at steady state delivers a power output of 17 hp. The engine receives energy by heat transfer in the amount of Qh = 33 kJ during each cycle of operation from a high temperature thermal reservoir at Th = 870 K. The system is executing 50 cycles per minute. Determine the amount of work that is delivered during each cycle in kilojoules. Determine the actual efficiency at which the system is operating. Assuming this engine is as efficient as possible, what would the temperature, in degrees celsius, of the colder reservoir be?
a. b. 4. Based on the first law of thermodynamics, which of the following is wrong? The sum of the work and energy change is equal to the heat transferred. The heat transfer can not exceed the work done. C. The net heat transfer equals the net work of the cycle. d. The net heat transfer equals the energy change if no work is done. nstanti