find the circumference ... 2 π r
it goes around 3.5 times in one sec ... in one second, the outer edge travels
... 3.5 circumferences
the radius of a CD is 0.06 m and it rotates at 3.5 rew/ s when playing music at the outer edge.find the maximum tangential speed of the disk.
2 answers
Circumference = 2pi*r = 6.28 * 0.06 = 0.3768 m/rev.
Speed = 3.5rev/s * 0.3768m/rev = m/s.
Speed = 3.5rev/s * 0.3768m/rev = m/s.