Ask Question
21 February, 20:52

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) ?

+2
Answers (1)
  1. 21 February, 21:03
    0
    The 'seconds' hand on the watch goes all the way around in 1 minute. 15 seconds is 1/4 of a complete 1-minute revolution. So, the 2 cm is 1/4 of the way around the circle that the tip makes. This makes the full circumference of the circle 8cm.

    The length of the second hand will be the radius of the circle. Use the following equation:

    2 pi radius = circumference

    Since we know the circumference, plug that in, and solve for the radius:

    2 pi radius = 8 cm

    radius = 8cm / 2 pi = 1.27 cm
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “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) ? ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers