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16 February, 17:07

The 8.00-cm long second hand on a watch rotates smoothly.

What is its angular velocity?

What is the speed of the tip of the hand?

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Answers (1)
  1. 16 February, 17:32
    0
    The watch hand covers an angular displacement of 2π radians in 60 seconds.

    ω = 2π/60

    ω = 0.1 rad/s

    v = ωr

    v = 0.1 x 0.08

    v = 8 x 10⁻³ m/s
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