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Calculating pressure given dia. and pounds

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  • #1
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Homework Statement


the hydraulic lift for an automobile service garage has a cylinder with a diameter of 8 inches. What pressure must the oil have to be able to lift 6000 lbs?


Homework Equations


f=pa
area = pi(r^2)


The Attempt at a Solution


6000 lbs = 26 688 Newtons

8 inches = 3.14 x 16 = 50.265

26 688/50.265 = 530.9 psi (should be 119 psi)
 

Answers and Replies

  • #2
PhanthomJay
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Homework Helper
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Homework Statement


the hydraulic lift for an automobile service garage has a cylinder with a diameter of 8 inches. What pressure must the oil have to be able to lift 6000 lbs?


Homework Equations


f=pa
area = pi(r^2)


The Attempt at a Solution


6000 lbs = 26 688 Newtons
do not convert...leave in pounds of force
8 inches = 3.14 x 16 = 50.265
units...A = 50.265 in^2
26 688/50.265 = 530.9 psi (should be 119 psi)
If the problem is given in units of inches and pounds, do not convert pounds to newtons.
 
  • #3
106
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thanks
 

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