I'm having problems on the fouth webassign. The first problem is kicking my butt. I have worked out the entire problem using the exapmle found on page 94 of the book. But no of my answers work, can anyone help?

9/9/2006 10:28:03 PM

post the question...

9/9/2006 11:26:54 PM

A 134 N bird feeder is supported by three cables as shown in Figure P4.17. Find the tension in each cable. The degree angles are 60 on cable one, the left one, and 30 degrees on cable two, the right one.

9/10/2006 6:50:27 PM

Just set up a force balance equation. The components in the x direction have to sum to zero, as do the components in the y direction. The components of tension in the strings can be expressed as sines or cosines of the angles times the total tension in each string.

Remember that in the Y direction you have the downward force of the wieght of the bird feeder. When you have your x and y sums you should have 2 equations and 2 unknowns. You should be able to solve that easily enough.

[Edited on September 11, 2006 at 6:57 PM. Reason : ]

9/11/2006 6:57:05 PM