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CBSE Class 9 Answered

What is the speed of seconds hand of your watch whose radius is 1.5 cm
Asked by itishreepanda999 | 31 May, 2018, 09:07: PM
answered-by-expert Expert Answer
We know , 
Distance =Speed × time
Thus for watch,
Time = circumference / speed 
Time taken for revolution is =1 minute= 60 seconds
r= 1.5 cm =0.015m
circumference = 2πr= 2×3.14×(0.015)
 
Therefore,
s p e e d equals fraction numerator 0.0942 m over denominator 60 space s end fraction t h u s comma space s p e e d space equals space 0.00157 space m divided by s space equals space 1.57 cross times 10 to the power of negative 3 end exponent m divided by s
Answered by Shiwani Sawant | 05 Jun, 2018, 11:11: AM

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