Question

Length of the minute hand of a clock is 5cm. Calculate it's speed in completing one round.....

Answer 1

length of the minutes hand of a clock is5cm

calculate the speed 60/5

speed 10

Answer 2

The end of the arrow of the hand rotates in a circle of radius 5 cm. It moves the circumference = 2 π 5 cm in one rotation, that is 60 minutes = 3600 seconds.

So the LINEAR speed of the TIP of the minute hand = 2π * 0.05 meter / 3600 sec

        = 0.0000872 meters/sec or 0.08 mm/sec

        = 31.4 cm / hour

The angular speed of the minutes hand is :

        360 degrees / 3600 seconds = 0.1 degree/second