A large sofa weighs 2000 N is put a floor with a coefficient of friction u = 0.8. A horizontal push of 1600 N is applied to the sofa. What will happen?

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.