Question

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​

Answer 1

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