This one’s a lot like Problem 2, except that instead of being given all the weights and figuring out the angles (or slopes), we’re given a mixture of the weights and angles and will have to figure out the rest.
The angle at A between the two parts of the string is still 90°, which is nice, because right triangles are easy to work with. The free-body-diagram and polygon of forces at A is shown below.
The remaining weights are easily calculated by trigonometry:
and
Last modified: January 22, 2009 at 8:32 PM.