If it takes 10 seconds for the speed of a block, which is sliding on a rough horizontal table, to drop from 4 m/s to zero, what is the value of μk? (a) 0.01 (b) 0.04 (c) 0.10 (d) 0.40 (e) 0.60

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