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anonymous
 4 years ago
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?
anonymous
 4 years ago
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?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1349481173829:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes, it 'released' without initial speed right?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0isnt the initial speed 1.9 m/s?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0No, that's the speed at B.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh ok so you got the zero from A?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0but the book says tha answer is 0.18m but how would you get that answer?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I got the same answer. I wrote the formula at the picture:\[h=\frac{v^2}{2g}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0when it comes to a pendulum does it not depend on the lenght of the string?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ok, so you would use that formula, h=v^2/2g to get 0.18m?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0@Jasminebunnies : Yes

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ohhh ok and the zero is put there because there is no mass?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Omg! (^ ^!) Which zero?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0lol! the zero in your original equation that you said came from A, in front of mgh

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0That's because v=0 at highest point.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ohhh ok, is that because it has not been released at that point?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Because by the time the pendulum is released, the velocity is zero. It start from rest.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yes, ok! thank you! I understand now :)
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