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Old Mar 11th 2009, 12:32 AM   #1
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Join Date: Mar 2009
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Which formula do I use?

The question asks to determine the distance traveled (s) in 2.00 sec by a particle on the rim of a disk with radius 8 cm, 1200 rotations per minute. How do I know to use the formula s=(omega)rt and not the kinematic equation s=s(initial)+(omega)t+(alpha)t^2??
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Old Mar 11th 2009, 12:48 AM   #2
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s, in the equation given by you is not the linear displacement. It is actually the angular displacement (theta). Use the formula to find the (theta), multiply it by the radius to get the linear distance travelleled by the particle.
Note (theta) = (omega)*t and when you multiply by radius you get (omega)rt.
the two formulae are the same.
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