At a given instant in time, a 6-kg rock that has been dropped from a high cliff experiences a force of air resistance of 15 n. what are the magnitude and direction of the acceleration of the rock? (do not forget the gravitational force! ) round the final answer to two decimal places.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg