Question

A figure skater begins spinning counterclock-

Answer 1

Answer:

Angular acceleration, $\alpha =0.64\ rad/s^2$

Explanation:

Given that,

Initial angular velocity, $\omega_i=4.67\ rad/s$

The final angular velocity, $\omega_f=7.37\ rad/s$

Time, t = 4.2 s

We need to find her average angular acceleration  during this time interval. Acceleration is the rate of change of velocity. So,

$\alpha =\dfrac{\omega_f-\omega_i}{t}\\\\\alpha =\dfrac{7.37-4.67}{4.2}\\\\\alpha =0.64\ rad/s^2$

So, her average angular acceleration is $0.64\ rad/s^2$.