Help pls.. trigo problems?

Question

9. A weight of 150 pounds on a smooth plane surface which makes an angle of 35degree with the horizontal. The weight is held in place by string parallel to the surface and fastened at the top of the plane. Find the pull on the string

Suggestion: (The pull will be equal to the components of the 150 pounds weight parallel to the plane.)

Answer 1

First draw the Free-Body Diagram.  By saying "smooth" they want you to disregard friction on the ramp.

You should be able to show the tension in the string to be

150 sin (35 degrees) lbs

= 15 (0.574) lbs

=  86.04 lbs