A tin of paint has a total mass of 7000g and a volume of 5000 cm³. The empty tin has a mass of 500g. Determine the mass of paint.

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.