SOLUTION: The force needed to pry a nail from a piece of wood varies inversely with the length of the crowbar used to remove the nail. If a 6 inch long crowbar requires 15 pounds of force,

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Question 532168: The force needed to pry a nail from a piece of wood varies inversely with the length of the crowbar used to remove the nail. If a 6 inch long crowbar requires 15 pounds of force, how many pounds are required by an 18 inch long crowbar?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The force needed to pry a nail from a piece of wood varies inversely with the length of the crowbar used to remove the nail.
If a 6 inch long crowbar requires 15 pounds of force, how many pounds are required by an 18 inch long crowbar?
:
Let f = the force required using an 18'
:
An inverse ratio equation makes this easy.
6%2F18 = f%2F15
cross multiply
18f = 6 * 15
18f = 90
f = 90/18
f = 5 lb of force for an 18"