Statics Problem involving blocks, rope, pulleys and springs...

  • Thread starter jbakes
  • Start date
  • #1
jbakes

Homework Statement


Statics_zpss1j1d1dw.png

The angle at the bottom is 25 degrees

Homework Equations


Springs Parallel;
keq = k1 +k2
Sum Forces = f1 + f2
x = f1/k1 = f2/k2

Springs Series;
1/keq = 1/k1 + 1/k2
Sum x = x1 +x2
F = k1x1 =k2x2


The Attempt at a Solution


Basically I'm having trouble finding the spring constant (Keq)23
I've worked out all the diagrams and if I could just find the spring constant I could then plug it into my FBD@E and find the tension. Then from there I can plug the tension into my Moment equation and find the force in spring one and solve for x.
 

Attachments

Answers and Replies

  • #2
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,296
I think you should show your working.

I haven't attempted to solve the problem (and not sure I can) but I note that they ask you to calculate the spring constant in Q3. That's possibly a clue that the spring constant isn't needed to work out the answer to Q1 and Q2.
 
  • #3
scottdave
Science Advisor
Homework Helper
Insights Author
1,783
746
Look at point A. That rope pulls up with a certain tension. This is tied to a spring, which must pull up with the same tension as the rope at A, since nothing is accelerating. So this brings us to point G: The spring must be pulling down at G with the same force as it is pulling up. You should be able to find the vertical forces at G, in terms of the main Tension and the angles. Take this upward force with the upward Tension at C, then the block B weight, and sum the moments about D, to solve for the Tension.
 

Related Threads on Statics Problem involving blocks, rope, pulleys and springs...

Replies
1
Views
2K
Replies
4
Views
1K
Replies
1
Views
7K
  • Last Post
Replies
0
Views
930
Replies
9
Views
15K
Replies
1
Views
1K
Replies
1
Views
2K
Replies
2
Views
2K
Replies
3
Views
2K
  • Last Post
Replies
12
Views
4K
Top