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You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 1.5060E+4 J of thermal energy from your lunch to cool it to the temperature of the inside of the refrigerator. In the meantime, this means the refrigerator produces 2.0466E+4 J of thermal energy that it expels into the kitchen as a result.
1) What is the total work done by the compressor motor in the refrigerator? (Ignore any thermal loses due to friction in the motor.)
2) What is the Coefficient of Performance for the refrigerator?
3) Your refrigerator actually acts like a heater in your kitchen. Suppose you have a small electric space heater that has a power output of 1.4kW. How long would this heater have to run to produce the same amount of heat as the refrigerator produced while cooling your leftovers?
4) It takes electricity to run the motor on the refrigerator. If your cost of electricity is 17 cents per kilowatt*hour, how much does it cost (in cents - do not enter units) to cool your lunch down?
An ideal gas is taken through a Carnot cycle. The isothermal expansion occurs at 240°C, and the isothermal compression takes place at 50.0°C. Find the energy expelled to the cold reservoir in each cycle
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 7.948 g, is pressed into a leaf of 1.547 m thickness.
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 2.85 multiplied by 10-4 m3, What mass of gold is contained in the rock
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The G string of a guitar which should be 397 Hz is playing flat at 380 Hz. What percentage change in the tension of the wire is necessary so as to tune the string to 392 Hz.
A firework explodes 120 m above the ground. Determine the time difference between two observers hearing the explosion
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