An air-conditioning system is used to maintain a house at 72oF when the temperature outside is 90oF. If this air-conditioning system draws 5 hp of power when operating, determine the maximum rate of heat removal [BTU/min] from the house that it can accomplish.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?