Question

Pls help me please!!!!!

A floppy disk in a commuter rotates from test to an angular velocity of 3.14 rad/sec in a time of 0.8 sec.
(a) what is the angular acceleration?
(b) what is the angle that the disk rotates in coming to this velocity?

Answer 1

Explanation:

$\omega = 3.4 \frac{rad}{s} \\ time \: = 0.8s \\ \omega1 = 0 \\ we \: \omega = 3.4 know \: that \\ \omega = \omega1 + \alpha t \\ \alpha = \frac{ \omega}{time} = \frac{3.4}{0.8} = \frac{17}{} \frac{rad}{ {s}^{2} } \\ \omega = \frac{\theta \: }{t} \\ \theta = \omega \times t = 0.8 \times 3.4 = 2.75 rdian$