The brick wall (of thermal conductivity 0.77 W/m · ◦ C) of a building has dimensions of 3 m by 15 m and is 7 cm thick. How much heat flows through the wall in a 8.4 h period when the average inside and outside temperatures are, respectively, 29◦C and 5◦C? Answer in units of MJ.

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.