Awater skier is pulled behind a boat. when the skis push down on the water, what is the reaction force? a. the skier pulls back on the boat. b. earth's gravity pulls down on the skis. c. the water pushes up on the skis. d. the boat pulls the skier.

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?