As an audio CD plays, the frequency at which the disk spins changes.

At 210 rpm, the speed of a point on the outside edge of the disk is 1.3 m/s.

At 420 rpm, the speed of a point on the outside edge is ___ m/s.

The velocity is 2.5997 m/s.  

Explanation:

The given condition :-

1) N = 210 rpm

speed ( v ) = 1.3 m/s.

We know that ,

v = r ω

where r = radius of disk.

ω = angular velocity.

But ω =

r = 0.059144 m

2) N = 420 rpm

v = 2.5997 m/s.  

So we get the velocity v = 2.5997 m/s.  

answer: electrons

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide