Physics Help!

[Wheatmaster]

i hate asking for help on school work but i realize that if i don't, i won't understand it.

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number 17.

for a) and b) i tried plugging in for mgR=(1/2)(I)(omega)^2 but i just don't get the right answers.

 

[jai6638]

just fyi .. :http://physicsforums.com