 #1
 41
 2
Homework Statement
For problems 102 and 103, find the value of M_{c} required to maintain equilibrium, and find the forces at C. M_{a} is given as 20 Nm for both problems. [/B]
Homework Equations
Start with AB. The geometry is a 3/4/5 triangle, so AB is 100mm or 0.1 M.
So 20NM=0.1B
B=20/0.1 or 200N
So the force at B has to be 200N at the 53.1degree angle dictated by the geometry.
[/B]
The Attempt at a Solution
I found, online, a solution to problem 103; the parameters are different but I understand the logic given for problem 103.
I see the subtle difference between 102 and 103: in 103, the collar can only move along AB, and in 102, the collar can only move along CB.
For problem 102, the book's answer is Cx = 217N.
Intuitively, this makes no sense.
How can Cx be more than the 200N force at B? The force at B, which is 200N, would be the hypotenuse of a triangle that would intersect Cx and Cy. So Cx would have to be smaller than 200N.
Is the 200N force at B not correct for problem 102?
Thank you in advance for any insight! :^)
[/B]
Attachments

64.2 KB Views: 609

27.2 KB Views: 528