Acapacitor can be charged by the battery when the switch at the right is closed. if the capacitor is initially uncharged, how does the brightness of the bulb change with time after the switch is closed? select one of the following: (a) the bulb becomes brighter with time. (b) the bulb becomes dimmer with time. (c) the bulb glows with a constant brightness.

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 the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct.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