Bob asked in Science & MathematicsMathematics · 2 months ago

Math Help Quick pls?

The second hand on a clock makes 1 revolution per minute.

If the second hand is 10 cm long, determine the exact distance that the tip of the second hand travels in 12 seconds.

3 Answers

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  • 1 month ago

     The second hand on a clock makes 1 revolution per minute.

     If the second hand is 10 cm long, 

     the exact distance that the tip of the second hand travels 

     in 12 seconds is 0.4 π cm or 1.2566 cm.

  • Vaman
    Lv 7
    2 months ago

    in 12 hours, it covers on circle. In 12 sec how much

    2*pi*10/( 12*60*60)*12= 20 pi/(3600)=pi/180 cm=0.01745 cm

    2 pi r=62.83

    12*60*60/12*0.01745=62.82

  • 2 months ago

    Circumference = 2 π r    Find the circumference  for r = 10 cm

    Now  multiply by a fraction  of   12 /60   since you did not travel around a complete circle ,  only 12/60 ths  of it.

    reduce to lowest terms.

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