The surface of the water in a water-storage tank that is vented at the top is 30 m above a water faucet in the kitchen of a house. (a) What is the gauge pressure of the water at the faucet? (b) What is the force due to the water pressure acting on a valve which turns the faucet in part (a) off if the valve has a circular shape of diameter 0.60 cm?

Answers: (a) 2.9 x 10 ⁵ Pa      (b) 11 N