the second's hand of a watch is 2 cm long.the speed of the tip of the hand is________

Asked by  sabreen | 23rd Jul, 2013, 07:52: PM

Expert Answer:

we know that speed=distance / time.
distance travelled by seconds hand is 2*pi*r( circumfrence)
n time =60 seconds to complete the circumference of watch.
r=2cm
so speed =2* pi* 2/60  cm/sec

Answered by  | 23rd Jul, 2013, 09:31: PM

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