Posted by **Steph** on Saturday, April 23, 2011 at 11:12pm.

A 10-kg ladder 2.5m long rests against a frictionless wall with its base on the floor 80cm from the wall. How much force does the top of the ladder exert on the wall?

- Physics -
**drwls**, Sunday, April 24, 2011 at 2:08am
This question has been answered by Damon

http://www.jiskha.com/display.cgi?id=1303587287

The moment of the ladder about the floor support point is zero. The 98 N ladder weight acts downward 0.4 m from the wall.

The wall contact point is sqrt[2.5^2-0.8^2] = 2.37 m above the floor. The force F at the wall contact point is normal to the wall, because it is frictionless there.

Setting the total moment equal to zero,

98*0.4 = F*2.37

F = 16.54 N

## Answer This Question

## Related Questions

- Physics - A 10-kg ladder 2.5m long rests agaist a frictionless wall with its ...
- Physics - Q #2: (only other one I'm stuck on...) A 10-kg ladder 2.5m long rests ...
- Physics - A uniform 250 N ladder rests against a perfectly smooth wall, making a...
- phsics - uniform ladder 25 ft long rests against a smooth vertical wall. The ...
- Calculus - a 5m ladder rests against a vertical wall. The top of the ladder ...
- physics - A uniform 250 N ladder rests against a perfectly smooth wall, making a...
- Math 2 - The bottom of the ladder rests on a horizontal flat surface and the top...
- Physics - A uniform 160 N ladder rests against a perfectly smooth wall, making a...
- Physics - A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0...
- Calculus Ladder Problem - A ladder 20 ft long rests against a vertical wall. Let...

More Related Questions