SOLUTION: I REALLY NEED HELP HERE.... A 3M BAR IS USE TO LIFT A STONE. A 90 KG PERSON EXERTS ALL HIS WEIGHT TO ONE END OF THE BAR WHICH IS 2 1/2M FROM THE FULCRUM AND BALANCES THE STONE. TH

Question 181321: I REALLY NEED HELP HERE....
A 3M BAR IS USE TO LIFT A STONE. A 90 KG PERSON EXERTS ALL HIS WEIGHT TO ONE END OF THE BAR WHICH IS 2 1/2M FROM THE FULCRUM AND BALANCES THE STONE. THE WEIGHT OF THE STONE IS APPROXIMATELY.
A. 500
B. 450
C. 400
D. 45KG
Found 2 solutions by vleith, Fombitz:
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
The force at the end you are on is given by

Since you balance, the force on the other end is

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Set up a moment (force x distance) equilibrium equation.

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

.
.
.
The force, in this case, is gravity,

.
.
.
B.)450 kg.

RELATED QUESTIONS
a 3M BAR is used to lift a stone. A 90 kg person exerts all his weight to one end of the... (answered by stanbon)
PLEASE HELP A 3m bar is used to lift a stone . A 90 kg person exerts all his weight to... (answered by Fombitz)
If a uniform bar is to balance on a fulcrum, the ration of the larger weight to the... (answered by solver91311,stanbon)
A man places one end of a crowbar 5.5 feet long under a rock. At a 4.5 inches from the... (answered by venugopalramana)
A horizontal bar of negligible weight has an 82.6 lb weight hanging from the left end and (answered by venugopalramana)
Provided: W1�x = W2(L - x), where W1 and W2 are weights on either side of a balance... (answered by rothauserc)
a metal bar weighing 180 kg is divided into two parts, so that the radio of the weight of (answered by ikleyn)
Two guys walk into a bar; the third one ducks. If these three men acted independently,... (answered by Boreal)
An 18kg mass is placed at one end of a steel bar that is 1m long. A 35kg mass is placed... (answered by checkley71,scott8148)