Physics, 19.06.2020 18:57 lesgumball
Why are people anti to LGBTQ :( 1)Where did this event start? 2)Where is this event currently happening? 3)When did this event start? 4)Why is this event happening?
Answers: 2
Physics, 22.06.2019 08:00
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
Physics, 22.06.2019 13:10
A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgļk) and water is cw = 4190 j/(kgļk)
Answers: 3
Physics, 23.06.2019 11:00
Abox that has self-contained cable clamps holds two light switches. a two-wire no. 12 cable with ground feeds the box, and a pair of two-wire no. 12 cables (four conductors) with ground wires leaves the box to feed the light fixtures. the second switch is fed by a no. 12 jumper wire from the first switch. which one of the following box combinations would furnish the minimum allowable volume? a. two 3-inch Ć 2-inch Ć 21ā2-inch gangable device boxes b. two 3-inch Ć 2-inch Ć 11ā2-inch gangable device boxes c. two 3-inch Ć 2-inch Ć 23ā4-inch gangable device boxes d. two 3-inch Ć 2-inch Ć 21ā4-inch gangable device boxes
Answers: 2
Why are people anti to LGBTQ :( 1)Where did this event start? 2)Where is this event currently happen...
Mathematics, 24.07.2020 20:01
English, 24.07.2020 20:01
Mathematics, 24.07.2020 20:01
Mathematics, 24.07.2020 20:01
History, 24.07.2020 20:01
Computers and Technology, 24.07.2020 20:01
English, 24.07.2020 20:01
Mathematics, 24.07.2020 20:01