Difference Between To Question In Thermodynamics

moha_9

29th September 2011 - 07:45 AM

Hi all ,

Actually, I don't know the difference between these two questions . One of them only , we consider the ambient pressure .

Q. A hydraulic lift has a maximum fluid pressure of 500 kPa. What should the piston-cylinder diameter be so it can lift a mass of 850 kg?

Q. The hydraulic lift in an auto-repair shop has a cylinder diameter of 0.2 m. To what pressure should the hydraulic fluid be pumped to lift 40 kg of piston/arms and 700 kg of a car?

Ron

29th September 2011 - 04:18 PM

Hi Moha,
The 'hydraulic' pressure is the variable (no ambient) you should be able to solve this with one variable. (F=pA).
You've got some work from there, but give it a shot.
Peace,
Ron

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