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On a stopwatch, the tip of the second hand moves 2 cm in 15 seconds. How long is the second hand (to the nearest tenth)?

 May 14, 2021
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15 seconds is 90o on the clock face

   this is  1/4 of the total circumference

 

circumference = 2 r pi

 

    2 r pi * 1/4 = 2 cm

         r = 2cm / (2 pi)   * 4 = 1.3 cm

 May 14, 2021

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