For all parts of this problem, assume the effects of viscosity are negligible. (

Question

For all parts of this problem, assume the effects of viscosity are negligible.

(B) A water cannon 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?

( C) 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 witha 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 mm2) to keep the car at a constant height?

(D) If the car is allowed to sink by 1 mm (and thus push the large piston down by 1 mm), how far does the small piston rise?

Explanation / Answer

C. Applying pascal law, pressure remains constant

so, F/10 = 10,000/10,000

so, F=10 N

D. volume of fluid displacement should be same.

so, 10,000 mm^2 x 1 mm = 10 mm^2 x h

so, h= 1000 mm

so small piston will rise by 1000 mm.

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