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Question
What is the average speed of second hand of a wrist watch? Given radius of the watch is 'r' metre.
What is the average speed of second hand of a wrist watch? Given radius of the watch is 'r' metre.
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Solution
The correct option is D One circumference of the clock = 2πr m/min
Distance covered by the second hand in 1 min. = 2πr metre
Where, r = radius of watch
Therefore, Speed = 2πr / 1 = 2πr m/min
One circumference of the clock = 2πr m/min
Distance covered by the second hand in 1 min. = 2πr metre
Where, r = radius of watch
Therefore, Speed = 2πr / 1 = 2πr m/min
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