The weight of a piston of area A creates a force F on a large tank of water of the same area A. A small diameter tube protrudes from the side of the tank and bends upwards, discharging a jet at a speed Vfrom a nozzle located at height H relative to the piston-water interface.

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.