CBSE Class 11-science Answered
the minute hand of watch is 1.5 cm long . how far will its tip moe in 40 min?
Asked by | 17 Jun, 2008, 10:49: PM
Expert Answer
This problem is related to the perimeter of the circle where radius is 1.5cm
2 pi r is the formula to find the perimeter of 1 whole circle but in 60 minutes a minute hand completes 1 whole circle.
we need perimeter of = 40/60 = 4/6 = 2/3 so we need 2/3 rd of the perimeter.
perimeter of the required part is = 2 x 3.14 x 1.5 x 2/3 = 6.28cm
Answered by | 17 Jun, 2008, 11:04: PM
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