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