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Vanyuwa [196]
2 years ago
12

A wheel rotates about a fixed axis with an initial angular velocity of 13 rad/s. During a 8-s interval the angular velocity incr

eases to 57 rad/s. Assume that the angular acceleration was constant during this time interval. How many revolutions does the wheel turn through during this time interval
Physics
1 answer:
____ [38]2 years ago
4 0

Answer:

The number of revolutions is 44.6.

Explanation:

We can find the revolutions of the wheel with the following equation:

\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2}

Where:

\omega_{0}: is the initial angular velocity = 13 rad/s              

t: is the time = 8 s

α: is the angular acceleration

We can find the angular acceleration with the initial and final angular velocities:

\omega_{f} = \omega_{0} + \alpha t

Where:

\omega_{f}: is the final angular velocity = 57 rad/s

\alpha = \frac{\omega_{f} - \omega_{0}}{t} = \frac{57 rad/s - 13 rad/s}{8 s} = 5.5 rad/s^{2}

Hence, the number of revolutions is:

\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2} = 13 rad/s*8 s + \frac{1}{2}*5.5 rad/s^{2}*(8 s)^{2} = 280 rad*\frac{1 rev}{2\pi rad} = 44.6 rev

Therefore, the number of revolutions is 44.6.

       

I hope it helps you!

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