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April 18, 2015

April 18, 2015

Posted by **Stan** on Monday, October 29, 2012 at 6:13pm.

- Physics- Elena please help! -
**Elena**, Monday, October 29, 2012 at 6:22pm(a) ω₃=ε•t₃ =0.65•3 =1.95 rad/s

(b) ma=F(fr)

centripetal acceleration a=v²/R =ω²R

F(fr) =μmg

m ω²R= μmg

ω=sqrt(μg/R)=sqrt(0.42•9.8/0.18)=4.78 rad/s

(c) ω =ε•t

t= ω/ε=4.78/ 0.65=7.35 s

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