I'm not getting this-need some help

  • Thread starter bcjochim07
  • Start date
  • #1
374
0

Homework Statement


A 200g uniform rod is pivoted at one end. The other end is attached to a horizontal spring. The spring is neither stretched nor compressed when the rod hangs straight down. What is the rod's oscillation period? You can assume that the rod's angle from the vertical is always small. The rod's length is 20 cm and the spring's constant is 3N/m.



Homework Equations





The Attempt at a Solution



Without the spring the rod's angular frequency would be sqrt[(.200)(9.80)(.10m)/(.0027kgm^2) Then I could go to period. Will someone tell me how I can get the period for the spring? The problem is I am used to doing problems with just a spring and a block, but I am not quite sure how to deal with the extended object. Would I just use omega= sqrt [k/m] with mass .200kg and k = 3.0 N/m? Then I could go to period, and maybe add the two period together?
 

Answers and Replies

  • #2
454
0
For a simple harmonic oscillator the restoring force is F = ma = -kx. what is the total restoring force for the pendulum string combination? If that is in the form -kx you can use the equaton for the period of a simple harmonic oscillator.
 

Related Threads on I'm not getting this-need some help

  • Last Post
Replies
1
Views
1K
Replies
7
Views
1K
Replies
8
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
10
Views
2K
Replies
21
Views
5K
Top