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L electrical radiator containing heating oil is placed in a 50-m^3 room. both the room and the oil in the radiator are initially at 10 C. The radiator with a rating of 1.8 kW is now turned on. At the same time, heat is lost from the room at an average rate of 0.35 kJ/s. After some time, the average temperature is measured to be 20 C for the air in the room, and 50 C for the oil in the radiator. Taking the density and the specific heat of the oil to be 950 kg/m^3 and 2.2 kJ/kg*C, respectively, determine how long the heater is kept on. Assume the room is well-sealed so that there are no air leaks.
describe the mechanical properties of strength as an example lets choose a metal cutting file as it relates to
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determine the specific volume for the following saturated water a 15 psi x0.5 b 90 psi x0.4 c 145 psi x0.3 d 650 psi
As shown, a 150 lb bungee jumper wants to jump from the top of a 630 ft high bridge and be able to just touch the water below. Given that the bungee cord has a spring constant of 108 lb/ft, what should the bungee cord's relaxed length, l, be for t..
a heat pump heats a house in the winter and then reverses to cool it in the summer. the interior temperature should be
a rigid well insulated container is outfitted with a moveable but frictionless partition that separates two sides but
approximate a boeing 777 aircraft as a system with a fixed mass of 200000 kg. the plane initially cruises at 270 ms at
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