Suppose an airline policy states that all baggage must be box shaped with a sum of length, width, and height not exceeding 132 in. what are the dimensions and volume of a square-based box with the greatest volume under these conditions? write a function for the volume v of the box in terms of w, one of the edges of the square bottom.

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 the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct.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.