Posted by Steph on Saturday, April 23, 2011 at 11:12pm.
A 10kg 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[2.5^20.8^2] = 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 10kg ladder 2.5m long rests agaist a frictionless wall with its ...
 Physics  Q #2: (only other one I'm stuck on...) A 10kg 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 ladder rests against a smooth wall (by smooth wall, we mean that ...
 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...
More Related Questions