SOLUTION: PLEASE HELP A 3m bar is used to lift a stone . A 90 kg person exerts all his weight to one end of the bar which is 2 1/2 m from the fulcrum and balances the stone. The weight of t

Question 181305: PLEASE HELP
A 3m bar is used to lift a stone . A 90 kg person exerts all his weight to one end of the bar which is 2 1/2 m from the fulcrum and balances the stone. The weight of the stone is approximately?
a. 500
b. 450
c. 400
d. 45 kg.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Set up a moment (force x distance) equilibrium equation.

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.
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Find the associated distances from the pivot for both forces.

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.
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The force, in this case, is gravity,

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B.)450 kg.

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