Question

Calculate the speed of minute hand of length 7cm

Answer 1

WE KNOW THAT,
SPEED=DISTANCE/TIME
HERE,
DISTANCE=2πr=43.96 CM=0.00044 KM
TIME=60 SEC=1 MIN=1/60 HRS

SPEED=43.96/1/60=0.00044×60=0.0264 KM/HR
                                                     =0.00733 M/S

Answer 2

circumference of clock=2*pi*r
r=7cm
circumference=2*22/7*7=44cm
speed=distance/ time
time=60sec
distance=44cm
then, speed=44/60
=0.73cm per sec