Physics
Physics, 19.01.2021 23:50, Savadt2810

Why’d I put this question in physics? It has nothing to do with psychics!!

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Physics, 21.06.2019 22:00, mattydoug4818
What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?
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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?
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Physics, 22.06.2019 12:00, SketchWasTaken
Apiston–cylinder device initially contains 0.07 m^3 of nitrogen gas at 130 kpa and 120 degree c. the nitrogen is now expanded polytropically (pvn=c) to a state of 100 kpa and 100 degree c. find the value of ‘n’ (in pvn=c) and determine the boundary work done during this process.
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Why’d I put this question in physics? It has nothing to do with psychics!!...

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