Posted by **Mike** on Sunday, November 25, 2012 at 7:02pm.

A homeowner is trying to move a stubborn rock from his yard which has a mass of 1025 kg. By using a lever arm (a piece of wooden board) and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum 24.4 cm from the rock so that it fits under the rock\'s center of weight. If the homeowner can apply a maximum force of 696.0 N, what is the minimum total length of board required to move the rock?

- Physics, Please Help -
**bobpursley**, Sunday, November 25, 2012 at 7:17pm
696*A=1025g*.244

solve for A, then length= L+.244 cm

- Physics, Please Help -
**drwls**, Sunday, November 25, 2012 at 7:19pm
The lever arm length from fulcrum to the end of the board is L. It must satisfy the moment-balance equation

L*696 = (1025 g)*0.244

g = 9.8 m/s^2

Solve for L. Add 0.244 m to L for the length of the board.

- Physics, Please Help -
**Mike**, Sunday, November 25, 2012 at 7:25pm
Thank you!!

## Answer This Question

## Related Questions

- HELP! - Physics - I need help with this. A frustrated farmer is trying to move a...
- Science - You Are Out In The Woods And You Need To Move A Boulder That Is In The...
- Science - Lever, You Find A Smaller Rock, Use As A Fulcrum, You Place It A Meter...
- physics - a construction wo4rker uses a board and log as a lever to lift a heavy...
- Physics - A 100N force acting on a lever 2m from the fulcrum balances an object ...
- physics - A NON-UNIFORM board of length L and mass M has a center of mass at 5/...
- physics - A man lifts various loads with the same lever. The distance of the ...
- physics - 3. A man lifts various loads with the same lever. The distance of the ...
- physics - a lever is 5 m long. The distance from the fulcrum to the weight to be...
- physics - A man lifts various loads with the same lever. The distance of the ...

More Related Questions