Force diagrams, Quick Question

  • #1

Homework Statement


http://img61.imageshack.us/img61/4585/8m1cdhx1.gif [Broken]

I understood every except, How do they get the 9 degrees in part c?

Homework Equations





The Attempt at a Solution

 
Last edited by a moderator:

Answers and Replies

  • #2
Doc Al
Mentor
45,140
1,439
Look at the components of the resultant of the three forces: using an inverse tangent you should be able to find the angle it makes with the x axis. (Draw a right triangle.)
 
  • #3
So then is arctan(30/190) 9 degrees?

(I don't have access to a radian calculator right now), also how do they get the 19N?
 
  • #4
Doc Al
Mentor
45,140
1,439
So then is arctan(30/190) 9 degrees?
Yes.
(I don't have access to a radian calculator right now), also how do they get the 19N?
You don't need a radian calculator. (If ever you don't have a calculator handy, Google has one.)

The 19 N makes no sense. But the components are close enough, so you should be able to figure the magnitude properly from that.
 
  • #5
So the real F is sqrt(130^2+30^2) am I correct?
 
  • #6
Doc Al
Mentor
45,140
1,439
So the real F is sqrt(130^2+30^2) am I correct?
Where did the 130 come from?
 

Related Threads on Force diagrams, Quick Question

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
2
Views
7K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
6
Views
981
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
891
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
10
Views
2K
Top