Homework Help: AP Physics B

Posted by Charlie on Wednesday, December 16, 2009 at 4:57pm.

The position of a 20 g oscillating mass is given by x(t) = (2.0 cm) cos(2t), where t is in seconds. Determine the following.

The Amplitude (cm.)
The Period (s.)
The Spring Constant (N/m)
The maximum speed (cm/s)
The total energy (J)
The velocity at t=0.40 s. (cm/s)

I need your help, please help me guys. Thanks!

AP Physics B - bobpursley, Wednesday, December 16, 2009 at 5:09pm
Well, all this is level one definition work. What is it you dont understand?
AP Physics B - Charlie, Wednesday, December 16, 2009 at 5:11pm
i figured out the amplitude and the period, i just dont kno how to get to the other 4 with using simple harmonic motion equations
AP Physics B - bobpursley, Wednesday, December 16, 2009 at 5:21pm
spring constant:

Period=2PI sqrt (m/k)

max speed= 2*2

energy= 1/2 k x^2

velocity= 2*2 sin2t
AP Physics B - Charlie, Wednesday, December 16, 2009 at 5:26pm
can u give me these in numbers please, i dont understand what formulas u wrote and what some of the stuff in ur formulas are
AP Physics B - bobpursley, Wednesday, December 16, 2009 at 5:32pm
Then you are in great trouble in Physics B. You need to review periodic motion in your text.
AP Physics B - Anna, Saturday, June 5, 2010 at 3:33pm
how do yo find the spring constant?

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