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Vikki [24]
4 years ago
7

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)?

Mathematics
2 answers:
gulaghasi [49]4 years ago
7 0

The answer is 1.27 Cm.

Komok [63]4 years ago
4 0
The 'seconds' hand on the watch goes all the way around in 1 minute. <span>15 seconds is 1/4 of a complete 1-minute revolution. </span>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.

<span>The length of the second hand will be the radius of the circle. Use the following equation: </span>

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  =<span>  1.27 cm</span>
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