The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s2 is :
Answer & explanation
Correct answer: option 2
Angular acceleration : \(\alpha\) = \(\frac{\omega_f - \omega_i}{t}\)
\(\omega\)f = 3120 x \(\frac{2 \pi}{60}\) rad/s
\(\omega\)i = 1200 x \(\frac{2 \pi}{60}\) rad/s
t = 16 s
\(\alpha\) = 4 \(\pi\)