Answer:
The angular acceleration is zero
Explanation:
When an object is in rotational motion, it has a certain angular velocity, which is the rate of displacement of its angular position.
This angular velocity can change or remain constant - this is given by the angular acceleration, which is:
[tex]\alpha =\frac{\Delta \omega}{\Delta t}[/tex]
where
[tex]\Delta \omega[/tex] is the change in angular velocity
[tex]\Delta t[/tex] is the time elapsed
Therefore, the angular acceleration is the rate of change of angular velocity.
In this problem, the bicycle rotates at a constant angular velocity of
[tex]\omega=25 rev/min[/tex]
This means that the change in angular velocity is zero:
[tex]\Delta \omega=0[/tex]
And so, that the angular acceleration is zero:
[tex]\alpha=0[/tex]
