Which of the following statements is not true: a. convection carries man-made chlorofluorocarbons (cfcs) up to the stratosphere. b. ultraviolet light from the sun dissociates the chlorine. c. chlorine acts as a catalyst that turns ozone (o3) into oxygen (o2). d. one chlorine atom destroys approximately 100 ozone molecules. e. ozone absorbs and consequently protects us from carcinogenic ultraviolet light from the sun

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Aa a of 22 m/s at an of 36.9 .be . a. b. c. (3)x y of? (3)go? (4) () it to to ?

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