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What are similarities and differences between refraction, reflection, diffraction and absorption?

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.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost