anonymous
  • anonymous
Conservation of Mechanical Energy: A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.9m/s. What is the initial height of the bob?
Physics
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
Why would K(A) be 0?
anonymous
  • anonymous
Yes, it 'released' without initial speed right?

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anonymous
  • anonymous
isnt the initial speed 1.9 m/s?
anonymous
  • anonymous
No, that's the speed at B.
anonymous
  • anonymous
oh ok so you got the zero from A?
anonymous
  • anonymous
Yup :)
anonymous
  • anonymous
but the book says tha answer is 0.18m but how would you get that answer?
anonymous
  • anonymous
*the
anonymous
  • anonymous
I got the same answer. I wrote the formula at the picture:\[h=\frac{v^2}{2g}\]
anonymous
  • anonymous
when it comes to a pendulum does it not depend on the lenght of the string?
anonymous
  • anonymous
U=mgl
anonymous
  • anonymous
ok, so you would use that formula, h=v^2/2g to get 0.18m?
anonymous
  • anonymous
@Jasminebunnies : Yes
anonymous
  • anonymous
ohhh ok and the zero is put there because there is no mass?
anonymous
  • anonymous
Omg! (^ ^!) Which zero?
anonymous
  • anonymous
lol! the zero in your original equation that you said came from A, in front of mgh
anonymous
  • anonymous
That's because v=0 at highest point.
anonymous
  • anonymous
ohhh ok, is that because it has not been released at that point?
anonymous
  • anonymous
@imron07
anonymous
  • anonymous
Because by the time the pendulum is released, the velocity is zero. It start from rest.
anonymous
  • anonymous
yes, ok! thank you! I understand now :)
anonymous
  • anonymous
ok ;)

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