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The figure shows a mass m-2kg moving in a circle at constant speed which is attached to a rotating
rod by two strings of length L=0.3m. The distance between where the strings attach to the rod is given
by d=0.25m. What is the tension in the upper string if the mass has the speed v required for the
bottom string to have zero tension?
(A) 29N
(B) 18N
(C) 34N
(D) 21N
(E) 47N
Rotating rod

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