Question

Q) The second hand of a watch is 2 cm long. The speed of the tip of this hand is?​

Answer 1

Answer:

the answer is 0

Explanation:

Answer 2

Answer:

0.21cm/sec

Explanation:

Angular speed of second's hand

ω= 2π/  revolution time(in sec)  

​ Revolution time of second's hand =1rev/min=1rev/60sec

⇒ ω=  2π/60sec

​ So the speed of tip of the hand is given by

⇒v=rω=2cm× 2π/60sec  ≃ 0.21cm/sec