Plz answer me right now even if you think it’s wrong I need an answer ASAP!!
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Physics, 17.05.2021 22:30, juliannabartra
Plz answer me right now even if you think it’s wrong I need an answer ASAP!!
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Answers: 2
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Physics, 22.06.2019 08:00, kaylaamberd
Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?
Answers: 2
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Physics, 22.06.2019 08:30, mikemurray115
How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects
Answers: 2
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Physics, 22.06.2019 18:30, july00
En un laboratorio, nakisha mezcla una soluciĂłn de hidrĂłxido de sodio con un indicador llamado fenolftaleĂna. cuando se combinan, crean una soluciĂłn de color rosa. nakisha se pregunta si la mezcla de otras soluciones con fenolftaleĂna tambiĂ©n creará este color rosa. ? cĂłmo podrĂa nakisha utilizar el proceso de investigaciĂłn cientĂfica para determinar si la mezcla de otras soluciones con fenolftaleĂna tambiĂ©n creará un color rosa? marque las que correspondan.
Answers: 2
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