Question

A disc of radius 10cm is rotating about its ais at an angular speed of 20 rad/s.Find the linear speed of
a)point on the rim
b)middle point of a radius

Answer 1

\[v=r \omega \]
v=0.1*20=2rad/s

So topmost:2v=4rad/s
Middle:v=2rad/s

Where am i wrong?

Answer 2

@Algebraic!

Answer 3

20 rad/s *.1 m = 2 m/s

middle point of the radius
20rad/s *.05 m = 1 m/s

Answer 4

on the rim?

Answer 5

on the rim
20 rad/s *.1 m = 2 m/s

Answer 6

isnt it twice of v at centre?