Gthe mass of the earth is about 81 times the mass of the moon. how is the earth's gravitational pull on the moon compared to the moon's gravitational pull on the earth? group of answer choices the moon’s gravitational pull on the earth is 9 times the earth’s gravitational pull on the moon. the moon’s gravitational pull on the earth is equal to the earth’s gravitational pull on the moon. the earth’s gravitational pull on the moon is 9 times the moon’s gravitational pull on the earth. the moon’s gravitational pull on the earth is 81 times the earth’s gravitational pull on the moon. the earth’s gravitational pull on the moon is 81 times the moon’s gravitational pull on the earth.

Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. the hot water is to be used when needed. the drawback is that energy is wasted because the tank loses heat when it is not in use, and you can run out of hot water if you use too much. some utility companies are encouraging the use of on-demand water heaters (also known as flash heaters), which consist of heating units to heat the water as you use it. no water tank is involved, so no heat is wasted. a typical household shower flow rate is 2.50 gal/min (9.46 l/min ) with the tap water being heated from 51.0 ˚f (10.6 ˚c) to 120 ˚f (48.9 ˚c) by the on-demand heater.what rate of heat input (either electrical of from gas) is required to operate such a unit, assuming that all the heat goes into the water?