Calculate the linear velocity of the tip of a second switch of length

1.	Calculate the linear velocity of the tip of a second switch of length 0.02 metre.
Answer» Answer: the linear velocity of the second's switch is 0.21 cm/s Explanation: Length of the SECONDS hand = 0.02 m Since in 60 seconds the second's hand completes one FULL revolution Therefore the DISTANCE COVERED in 1 second = $2\pi r$ r is the radius which is equal to the length of the second's hand = 0.02 m Therefore, distance covered in 60 seconds $=2\times\pi\times 0.02$ $=2\times 3.14\times 0.02$ $=0.1256$ m Speed = Distance/Time Speed of the second's hand $=\frac{0.1256}{60}$ $=2.09\times10^{-3}$ m/s $=0.21$ cm/s Therefore the linear velocity of the second's switch is 0.21 cm/s Hope this answer is helpful.