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Pendulum Oscillations

  • #1

Homework Statement


A physical pendulum consists of 4.8 m long sticks joined together as shown in Fig. 15-43. What is the pendulum's period of oscillation about a pin inserted through point A at the center of the horizontal stick?

http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c15/fig15_43.gif [Broken]




Homework Equations


w = sqt(MgL/I)
T = 2pi/w
I = 1/12ml^2 + 1/3ml^2
L = l/4

The Attempt at a Solution



I solved for I using the above equation 3, solved for L using equation 4, plugged these values into equation 1 getting angular velocity. Then I solved for T in equation 2 and I do not get the correct answer.
 
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Answers and Replies

  • #2
56
0
you have to acount for the fact that the centre of mass of the T-shaped pendulum is positioned higher then it would with just a simple one-stick pendulum
 
  • #3
you have to acount for the fact that the centre of mass of the T-shaped pendulum is positioned higher then it would with just a simple one-stick pendulum
how do i take that into account..?
 
  • #4
181
0
Wot: no string this time?
 
  • #5
Wot: no string this time?
What? lol

what are you asking
 
  • #6
181
0
What? lol

what are you asking
Refererence to "string+sphere" thread.

Your pendulum seems to be more rigid, but the problem
emphasizes the impotency of the moronic reliance on formulae.
 
  • #7
Refererence to "string+sphere" thread.

Your pendulum seems to be more rigid, but the problem
emphasizes the impotency of the moronic reliance on formulae.
Yea.. that doesn't help much =P
 
  • #8
Yea.. that doesn't help much =P
Could anyone else please provide some input?
 
  • #9
anyone??
 
  • #10
181
0
L is the distance between the pivot and c of m
You said "1/4"
It is 4.8m/4
 

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