Young's modulus Select all that applies. Select all that applies. A. is the slope of the stress vs. strain curve B. is a unitless quantity. C. is equal to strain divided by stress. D. scales with the size of the living things. Е. is proportional to stress times strain. F. is a property of the material.

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.