Question

calculate the speed of the tip of a second hand of watch of length 1.5 cm ?

Answer 1

Okay

Second hand moves 2π radians every 60 seconds (full circle)

Angular velocity ω = 2π / 60

=π / 30

speed of tip = speed of particle in a circle of radius 1.5 cm of angular velocity π/30

we know (or at least we should know) v= ωr

v= 1.5 * π÷30

v= 0.157 cm/s approx

hope this helps