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Jasminebunnies
Group Title
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?
 2 years ago
 2 years ago
Jasminebunnies Group Title
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?
 2 years ago
 2 years ago

This Question is Closed

imron07 Group TitleBest ResponseYou've already chosen the best response.3
dw:1349481173829:dw
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
Why would K(A) be 0?
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
Yes, it 'released' without initial speed right?
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
isnt the initial speed 1.9 m/s?
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
No, that's the speed at B.
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
oh ok so you got the zero from A?
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
but the book says tha answer is 0.18m but how would you get that answer?
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
*the
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
I got the same answer. I wrote the formula at the picture:\[h=\frac{v^2}{2g}\]
 2 years ago

Decart Group TitleBest ResponseYou've already chosen the best response.0
when it comes to a pendulum does it not depend on the lenght of the string?
 2 years ago

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

imron07 Group TitleBest ResponseYou've already chosen the best response.3
@Jasminebunnies : Yes
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
ohhh ok and the zero is put there because there is no mass?
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
Omg! (^ ^!) Which zero?
 2 years ago

Jasminebunnies Group TitleBest 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
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
That's because v=0 at highest point.
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
ohhh ok, is that because it has not been released at that point?
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
@imron07
 2 years ago

imron07 Group TitleBest ResponseYou've already chosen the best response.3
Because by the time the pendulum is released, the velocity is zero. It start from rest.
 2 years ago

Jasminebunnies Group TitleBest ResponseYou've already chosen the best response.0
yes, ok! thank you! I understand now :)
 2 years ago
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