Qualification > Sciences
Physics help!
nid404:
--- Quote from: Engraved on August 26, 2010, 12:15:13 pm ---At time 0, there would be 0 displacement, so therefore, the needle would stay in it's original position meaning that it would stay as on the diagram. Basically meaning a maximum or minimum point because it goes from a max to a min. The machine does not start on the piece of cloth.
If displacement is 0, then it has to be in its original position.
--- End quote ---
Yup I got that. I asked for part b) The value of a is 11 :S Shouldn't it be 8(the original position)? :-\
cooldude:
--- Quote from: ~Ahana~ on August 26, 2010, 01:59:38 pm ---Yup I got that. I asked for part b) The value of a is 11 :S Shouldn't it be 8(the original position)? :-\
--- End quote ---
no, okay so first of all it is at its maximum position and it can travel a total of 22mm, that means the equilibrium position is 11mm below, now what is a, the amplitude (the maximum displacement from the mean position) so it is 11mm. and w (omega)=2*pi*f, 2*4.5*pi=9pi radians/second
nid404:
Ahhh....ohkay that way...thanks dude..+rep :)
cooldude:
--- Quote from: ~Ahana~ on August 26, 2010, 02:17:24 pm ---Ahhh....ohkay that way...thanks dude..+rep :)
--- End quote ---
oh yeah and one more thing, u can also tell its starts from the maximum position cuz its a function of cos and not sine, and Thanks for the rep ;D
nid404:
yeah I figured that....didn't really notice what they were asking for. :-[
Ah...one more question
June 2010 paper 4 variant 1, Q3 b) How can they say acceleration is constant ? :S Is it because a=g ? :-\
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