Two boxes are placed at opposite ends of a 3.0 m long board. The board is supported underneath by a fulcrum. The box on the left has a mass of 25kg, and the box on the right has a mass of 15 kg. Ignoring the mass of the board, where should the fulcrum be positioned under the board in order to balance the masses horizontally?
a.
0.38 m from the right
c.
1.1 m from the left
b.
0.60 m from the right
d.
1.9 m from the left

Question

Two boxes are placed at opposite ends of a 3.0 m long board. The board is supported underneath by a fulcrum. The box on the left has a mass of 25kg, and the box on the right has a mass of 15 kg. Ignoring the mass of the board, where should the fulcrum be positioned under the board in order to balance the masses horizontally?
a.
0.38 m from the right
c.
1.1 m from the left
b.
0.60 m from the right
d.
1.9 m from the left

anonymous · Answer

I got A. on this one as well @Mashy

anonymous · Answer

wait lemme see!

anonymous · Answer

Don't worry! I have like 22 minutes left to submit this pre-test. I just wanted a 2nd opinion. I'm trying to pass them so i can move on in the lessons. I'm almost done with this credit!

anonymous · Answer

no i am afraid your answer is wrong this time.. mind telling me how you got that?

anonymous · Answer

Before i make a fool of myself, do i multiply the kg's then divide by 3?/

anonymous · Answer

or add? @Mashy

anonymous · Answer

I dunno.. you tell me :P.. think of the concept.. how would u find out where to place the fulcrum? what concept is involved here??