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March 5, 2015

March 5, 2015

Posted by **Jason** on Tuesday, November 20, 2012 at 1:41pm.

- physics -
**Damon**, Tuesday, November 20, 2012 at 2:03pmF = -k x = m a

if x = a sin 2 pi f t

v = 2 pi f a cos 2 pi f t

a = - (2 pi f)^2 a sin 2 pi f t

so

a= -(2 pi f)^2 x

then

-k x = -m (2 pi f)^2 x

(2 pi f)^2 = k/m

here T = 1/f = 1 so f = 1/1 = 1 Hz

(2 pi)^2 = 120/m

m = 30/( pi^2) = 3.04 kg

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