The length of seconds hand in a wall
clock is 15 cm. The displacement of
its tip in half minute is
1) 15 cm 2) 30 cm
3) 45 cm 4) 60 cm
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Explanation:
r= 1cm, w= (2pi/60) radian/sec, so v= (pi/30) cm/sec. ... It does this in 60 seconds so its speed is: 2 x pi x r / 60 cm per seconds = 0.105 ... The change in velocity of its tip in 15
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