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Physics Homework Question ??? Need Help !!!?
Need help on these Physics homework questions! In summer school taking physics.
1) What water pressure must a pump that is located on the first floor supply to have water on the thirteenth floor of a building with a pressure of 35 lb/in2. Assume tha the distance between each floors is 10ft.
2) The area of the large piston in a hydraulic jack is 25.5cm2. The area of the small piston is 12cm2.
(a) what force must be applied to the small piston is a weight of 800N is to be lifted?
3 Answers
- gooberLv 71 decade agoFavorite Answer
you have to pump water 120 ft.
Density of water is about 62 lb/ft^3 so the pressure per foot of depth is 62/144 = 0.43 psi
for 35 psi at 120 ft you would need 120 * 0.43 + 35 = 87 psi
2)
800 N * 12 / 25.5 = 376.5 N
- Anonymous1 decade ago
the pump has to provide pressure to support a column of water up to the 13th floor in addition to the desired pressure
2) go back and review the section on pascal's and archimedes' principles
- 1 decade ago
FORMUALA: FORCE X AREA DIVIDED BY SUMTHING LOL I FCKING HATE PHYISCS **** IT... ITS SUMMER! :)