Mary is an avid game show fan and one of the contestants on a popular game show. She spins the wheel, and after 5.5 revolutions, the wheel c

Question

Mary is an avid game show fan and one of the contestants on a popular game show. She spins the wheel, and after 5.5 revolutions, the wheel comes to rest on a space that has a $1500 value prize. If the initial angular speed of the wheel is 3.15 rad/s, find the angle through which the wheel has turned when the angular speed reaches 1.80 rad/s

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Eirian 2 months 2021-08-02T19:01:57+00:00 1 Answers 3 views 0

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    2021-08-02T19:03:51+00:00

    Answer:

    The angle is 23.2 radians, equivalent to 3.69 revolutions.

    Explanation:

    First, we need to find the angular acceleration of the wheel. This can be done using one of the kinematic formulas:

    \omega^{2}=\omega_0^{2}+2\alpha\theta\\\\\implies \alpha=\frac{\omega^{2}-\omega_0^{2}}{2\theta}

    Since the final angular velocity is zero after 5.5 revolutions (equivalent to 11π radians) we have that:

    \alpha=\frac{-(3.15rad/s)^{2}}{2(11\pi rad)}\\\\\alpha=-0.144rad/s^{2}

    Now, using the same equation, we can solve for the requested angle:

    \theta=\frac{\omega^{2}-\omega_0^{2}}{2\alpha}\\\\\theta=\frac{(1.80rad/s)^{2}-(3.15rad/s)^{2}}{2(-0.144rad/s^{2})}\\\\\theta=23.2rad

    Finally, it means that the angle through which the wheel has turned when the angular speed reaches 1.80 rad/s is 23.2 radians, equivalent to 3.69 revolutions.

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