
#1
Nov1307, 11:09 PM

P: 4

A piston of crosssectional area "a" is used in a hydraulic press to exert a small force of magnitude "f" on the enclosed liquid. A connecting pipe leads to a larger piston of crosssectional area A. (a) what force magnitude F will the larger piston sustain without moving? (b) If the piston diameters are 3.80 cm and 53.0 cm, what force magnitude on the small piston will balance a 20.0 kN force on the large piston?
A picture of the figure can be found at http://panda.unm.edu/Courses/Price/Phys160/F333.jpeg I used the formula f/a = F/A for (a). the answer I found was F = f x 195. Am i supposed to leave f in my answer. If no, how do i solve for f. I used the same formula for (b) and got 102. Please help me double check my answers. 



#2
Nov1407, 05:15 AM

HW Helper
P: 1,986

Seems to be correct. In the first Q, you just have to write fA/a, I think, because the values are given only in (b).




#3
Nov1407, 07:19 AM

P: 4

Thanks for the help.



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