PLEASE HELP ME SOLVE !!!!!!!!
posted by Katie on .
A mass of 11 kg is placed on a frictionless incline which is inclined at an angle of 69 degrees above the horizontal. It is held in place by a rope which is attached to a wall at the top of the incline. The rope is angled 13 degrees above the direction parallel to the incline, however. What is the normal force on the mass in Newtons?
help me solve please!!!!

This is not my area, but see if any of the following links will help:
http://search.yahoo.com/search?fr=mcafee&p=how+to+figure+a+normal+force+on+a+mass+in+Newtons
Sra 
First draw a diagram of the system (right), then draw the free body diagram (left), see:
http://imageshack.us/photo/myimages/192/1317926143.jpg/
With the forces isolated, weight (mg), tension on the rope (T), and the normal reaction (N), and the angles (in degrees) known, they can be readily resolved into the x and ycomponents and N calculated.
The equations to resolve forces are:
Vertical (solve for T)
mg=Tcos(8)
Horizontal (solve for N)
Ncos(21)=Tsin(8)