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Physics Paper4

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TJ-56:

--- Quote from: Sue T on May 10, 2011, 02:17:05 pm ---okkkkk sooooo E directly proportional to A2
E ---------> A2
15x10-3-------->(5x10-2)2
(80/100)15x10-3----------->a2

15x10-3 . a2 = (5x10-2)2 . (80/100)15x10-3

do the math im tired now  ::)

--- End quote ---

Again thanx, that cleared it up, I have totally forgotten about that equation.

Sue T:

--- Quote from: ruby92 on May 09, 2011, 07:55:55 pm ---o/n 2008 3c(ii)
M/j 2009 9b, 11 biii

--- End quote ---
on 2008 3cii) as it moves through the cloth, it is at a displacement of 3mm. there is a formula for the velocity at any point :
v = omega (sqroot(x2o- x2) where xo is ur amplitude
so just use this with a displacement of 3mm - ive attached smthin tht cod show why it is 3mm

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