Posted by 115 on Friday, April 20, 2012 at 9:59pm.
A wheel starts rotating from rest with uniform angular acceleration.After 3.0,its completes one revolution.Calculate a) angular velocity after 3.0s. b)angular acceleration c)angular velocity after completing d)time taken for second revolution

Physics  Elena, Saturday, April 21, 2012 at 12:00pm
2•π•N = ε•t^2/2,
ε = 4•π•N/t^2 = 4•π•1/3^2 =1.39 rad/s^2
ω = ε•t =1.39•3 = 4.19 rad/s.
2•π•N1 = ε•t1^2/2,
t1 =sqrt(4•π•N1/ ε) = sqrt(4•π•2/ 1.39) = 4.25 s.