Physics, 21.08.2019 05:10 JuanTorres7
You are installing a heat pump whose cop is half the cop of a reversible heat pump. you plan to use the pump on chilly winter nights to increase the air temperature in your bedroom. your bedroom's dimensions are 5.35 m ? 3.6 m ? 2.7 m. the air temperature should increase from 63° f to 68° f. the outside temperature is 35° f, and the temperature at the air handler in the room is 112° f. if the pump's electric-power consumption is 787 w, how long will you have to wait for the room's air to warm if the specific heat of air is 1.005 kj/(kg · c°)? assume you have good window draperies and good wall insulation so that you can neglect the release of heat through windows, walls, ceilings, and floors. also assume that the heat capacity of the floor, ceiling, walls, and furniture are negligible. (assume 1.293 kg/m3 for the density of air.)
Answers: 3
Physics, 21.06.2019 23:30
Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work
Answers: 1
Physics, 23.06.2019 02:10
The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).
Answers: 3
You are installing a heat pump whose cop is half the cop of a reversible heat pump. you plan to use...
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