On applying a consatnt torque, a wheel at rest, turns through `400` radian in `10 s`. Find angular acceleration. If same torque continues to act, what will be angular veclocity of the wheel after `20 s` from stars ?

Explanation

Here, `omega_(1) = 0, theta = 400 rad, t = 10 s, alpha = ?`
As `theta = omega_(1)t+ (1)/(2)alpha t^(2)`
`:. 400 = 0 + (1)/(2) alpha (10)^(2) = 50 alpha`
`alpha = (400)/(50) = 8 rad//s^(2)`
Now `omega_(2) =? T = 20 s`
As `omega_(2) = omega_(1) + alpha t`
`:. omega_(2) =0 + 8 xx 20 = 160 rad//s`