Discussion on: Problem 535 | Friction on Wedges

Submitted by Benjamin_Molina on

Following is a discussion on the Reviewer item titled: Problem 535 | Friction on Wedges. Feel free to add your own comments!

Benjamin_Molina Sun, 08/16/2015 - 08:16

Two questions, why is Phi + 1/2 Alpha =90 degrees. Where did we get the 90 degrees? Sin Alpha = Sin (180 degrees -2 Phi), How did we get sine? Thank you.

Jhun Vert Thu, 08/20/2015 - 07:30

Phi + 1/2 Alpha =90 degrees. Where did we get the 90 degrees?

arccos of zero = 90.
 

Sin Alpha = Sin (180 degrees -2 Phi), How did we get sine?

You can use Cos or Tan or Log or +x or -x or anything you want to do both sides of the equation. Sine however will serve the purpose.