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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?
 one year ago
 one year 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?
 one year ago
 one year ago

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JasminebunniesBest ResponseYou've already chosen the best response.0
Why would K(A) be 0?
 one year ago

imron07Best ResponseYou've already chosen the best response.3
Yes, it 'released' without initial speed right?
 one year ago

JasminebunniesBest ResponseYou've already chosen the best response.0
isnt the initial speed 1.9 m/s?
 one year ago

imron07Best ResponseYou've already chosen the best response.3
No, that's the speed at B.
 one year ago

JasminebunniesBest ResponseYou've already chosen the best response.0
oh ok so you got the zero from A?
 one year ago

JasminebunniesBest ResponseYou've already chosen the best response.0
but the book says tha answer is 0.18m but how would you get that answer?
 one year ago

imron07Best ResponseYou've already chosen the best response.3
I got the same answer. I wrote the formula at the picture:\[h=\frac{v^2}{2g}\]
 one year ago

DecartBest ResponseYou've already chosen the best response.0
when it comes to a pendulum does it not depend on the lenght of the string?
 one year ago

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

JasminebunniesBest ResponseYou've already chosen the best response.0
ohhh ok and the zero is put there because there is no mass?
 one year ago

imron07Best ResponseYou've already chosen the best response.3
Omg! (^ ^!) Which zero?
 one year ago

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

imron07Best ResponseYou've already chosen the best response.3
That's because v=0 at highest point.
 one year ago

JasminebunniesBest ResponseYou've already chosen the best response.0
ohhh ok, is that because it has not been released at that point?
 one year ago

imron07Best ResponseYou've already chosen the best response.3
Because by the time the pendulum is released, the velocity is zero. It start from rest.
 one year ago

JasminebunniesBest ResponseYou've already chosen the best response.0
yes, ok! thank you! I understand now :)
 one year ago
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