What are the importance of physical science?

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.

Which accurately compares concave and convex lenses?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2