for all parts of this problem, assume the effects of viscosity are negligible (a) the water cannon in the seattle center international fountain launch bursts of water 35 meters vertically into the air. before the cannon nozzle opens, the water inside is stationary. what pressure is the water under at the instant the launch begins? (b) from the mid- f= ? n term of winter 2012: a container with two moveable pistons is filled with incompressible oil with a specific gravity of 0.8. the larger piston has an area of 10,000 mm2 and on it is a car with a weight of 10,000 n and a specific gravity of 2.0. how much force must be applied to the smaller piston (which has an area of 10 mm") to keep the car at a constant height? 10,000 n a = 10 mm2 a = 10,000 mm2