# Homework Help: Diameter of the football players' piston?

1. Sep 25, 2009

### benedict9999

1. The problem statement, all variables and given/known data
A 54.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 130 kg football players at a height of 1.40 m. If her piston is 18.0 cm in diameter, what is the diameter of the football players' piston?

2. Relevant equations

3. The attempt at a solution

54 /18^2 = 520/x^2
x= 55.85696 cm

What am i doing wrong?

2. Sep 25, 2009

### Delphi51

Run that through your calculator again; looks like a calculation error.
Might be worth writing out the cross multiplication step.

3. Sep 25, 2009

### benedict9999

it's not... I still get the same answer running it through my calculator

4. Sep 25, 2009

### Staff: Mentor

Why do you think it is wrong?

Sig figs perhaps?

Edit: I must admit thread subject made me wonder if it is not XXX site link spam...

Last edited: Sep 25, 2009
5. Sep 25, 2009

### Delphi51

Sorry, I made the mistake! Checked it again and got your answer.

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