Some questions from an instructor given practice test. The angular velocity of a

Question

Some questions from an instructor given practice test. The angular velocity of a rotating wheel increases 2 rev/severy minute. the angular acceleration in rad/s squared is? A wheel starts from rest and has an angular acceleration of4.0 rad/s squared. The time it takes to make 10 revolutionsis? A wheel is spinning at 27 rad/s but is slowing with an angularaccel that has a magnitude given by (3.0 rad/s^4)t^2. It stops in atime of? Some questions from an instructor given practice test. The angular velocity of a rotating wheel increases 2 rev/severy minute. the angular acceleration in rad/s squared is? A wheel starts from rest and has an angular acceleration of4.0 rad/s squared. The time it takes to make 10 revolutionsis? A wheel is spinning at 27 rad/s but is slowing with an angularaccel that has a magnitude given by (3.0 rad/s^4)t^2. It stops in atime of?

Explanation / Answer

(a) The angular acceleration = 2rev/s / 60 s =4/ 60 rad/s2 = 0.209rad/s2 (b) we have = 1/2 t2 then the time taken to revolutions              t = (2/) = ( 2*10*2 / 4) =5.6s (c) we have      = t then t = / = 27 rad/s / (3rad/s2 ) = 9 s

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