Posted by rohan on Thursday, April 26, 2012 at 6:36am.
tension = sum of centrietal force+gravity
notice these are vectors.
tensionvertical= mg down
tensionhorizonal= m w^2 * rad
= .5*(2PI/.4)^2 * .8
now, after calculating that, you add them as vectors
tension= sqrt ( (mg)^2+(horizonalabove)^2 )
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