A child, hunting for his favorite wooden horse, is running on the ground around the edge of a stationary merry-go-round. The angular speed o

Question

A child, hunting for his favorite wooden horse, is running on the ground around the edge of a stationary merry-go-round. The angular speed of the child has a constant value of 0.233 rad/s. At the instant the child spots the horse, one-quarter of a turn away, the merry-go-round begins to move (in the direction the child is running) with a constant angular acceleration of 0.0136 rad/s2. What is the shortest time it takes for the child to catch up with the horse?

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Yến Oanh 5 years 2021-08-03T06:27:29+00:00 1 Answers 223 views 0

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  1. huyenthanh
    0
    2021-08-03T06:29:14+00:00
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    Answer:

    9.22 s

    Explanation:

    One-quarter of a turn away is 1/4 of 2π, or π/2 which is approximately 1.57 rad

    Let t (seconds) be the time it takes for the child to catch up with the horse. We would have the following equation of motion for the child and the horse:

    For the child: s_c = \omega_ct = 0.233t

    For the horse: s_h = s_0 + a_ht^2/2 = 1.57 + 0.0136t^2/2 = 1.57 + 0.0068t^2

    For the child to catch up with the horse, they must cover the same angular distance within the same time t:

    s_c = s_h

    0.233t = 1.57 + 0.0068t^2

    0.0068t^2 - 0.233t + 1.57 = 0

    t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

    t= \frac{0.233\pm \sqrt{(-0.233)^2 - 4*(0.0068)*(1.57)}}{2*(0.0068)}

    t= \frac{0.233\pm0.11}{0.0136}

    t = 25.05 or t = 9.22

    Since we are looking for the shortest time we will pick t = 9.22 s

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