A string is wrapped several times around the rim of a small hoop with(adsbygoogle = window.adsbygoogle || []).push({});

radius r = 7.90x10−2 m and mass 0.175 kg. The free end of the string

is pulled upward in just the right way so that the hoop does not move

vertically as the string unwinds.

a) Find the tension in the string as the string unwinds

** here I used the equation for I = MR^2

I = (0.175 kg)(7.90×10−2 m)^2 = 1.092×10−3 now how do I find

the tension?

b) Find the angular acceleration of the hoop as the string unwinds.

c) Find the upward acceleration of the hand that pulls on the free end of

the string.

Please help.

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# Unwinding hoop

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