Tension and sliding rod

  • Thread starter member 392791
  • Start date
  • #1

Homework Statement





Homework Equations





The Attempt at a Solution



So I am thinking about this problem, and what I don't understand is how at that point A, it is below the x-z plane, but it is not given how far below it is. If I knew, I could solve for the tension in the y-direction and set it equal to the weight.

I must be able to use c and 8 in. to get me closer to that distance below the x-z plane, but I'm not sure how
 

Attachments

  • problem 2.pdf
    26.7 KB · Views: 186

Answers and Replies

  • #2
PeterO
Homework Helper
2,435
62

Homework Statement





Homework Equations





The Attempt at a Solution



So I am thinking about this problem, and what I don't understand is how at that point A, it is below the x-z plane, but it is not given how far below it is. If I knew, I could solve for the tension in the y-direction and set it equal to the weight.

I must be able to use c and 8 in. to get me closer to that distance below the x-z plane, but I'm not sure how

use 3-D Pythagoras to calculate how far below the x-z plane the mass is each time. remember, the two masses are 18" apart.

If you don't understand 3-D Pythagoras, use normal Pythagoras on the 8" and c to find the direct distance across that void, the normal Pythagoras with the 18" cable/rod (or what ever it was) to calculate how far below the x-z plane A was in each case.
 
Last edited:
  • #3
TSny
Homework Helper
Gold Member
13,653
3,837
If (xA, yA, zA) and (xB, yB, zB) are the coordinates of A and B, respectively, how can you express the length of the wire in terms of these coordinates?
 
  • #4
Here is my attempt
 

Attachments

  • 2.99 attempt.pdf
    317.9 KB · Views: 163
  • #5
TSny
Homework Helper
Gold Member
13,653
3,837
Your work looks good, except you seem to have made a mistake in the final evaluation of T in part (a).
 

Suggested for: Tension and sliding rod

  • Last Post
Replies
3
Views
456
Replies
4
Views
244
Replies
17
Views
244
Replies
1
Views
758
  • Last Post
Replies
8
Views
738
Replies
13
Views
209
  • Last Post
Replies
27
Views
472
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
6
Views
207
Replies
6
Views
188
Top