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CBSE Class 8 Answered

The second's hand of a watch is 2cm long. The speed of the tip of the second's hand is:
a, 0.21 cm/s
b, 2.1 cm/s
c, 21 cm/s
d, 0.021 cm/s
 
explain in detail
Asked by shrinilassp | 07 Nov, 2015, 09:48: PM
answered-by-expert Expert Answer
begin mathsize 12px style we space know space that space speed equals distance space divided by space time. space distance space travelled space by space seconds space hand space equals left parenthesis space circumfrence right parenthesis space space equals space space 2 space cross times space straight pi space cross times space straight r space straight r equals 2 cm space space time space equals 60 space seconds space to space complete space the space circumference space of space watch. space speed space equals fraction numerator 2 space cross times space straight pi space cross times 20 over denominator 60 end fraction space equals space space 2.1 space space cm divided by sec space end style
Answered by Priyanka Kumbhar | 09 Nov, 2015, 09:38: AM

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