## Answer :

Speed is 4 times that. That is, 150.8 cm/s or 1.508 m/s.

If we get a point at distance 3 cm, we take the radius half of that. The circumference also gets half, so does the linear speed. We get 0.754 m/s or 75.398 cm/s.

a. What is its circumference in meters?

b. If the cd rotates 4 times per second, what is the linear speed of a point on the outer edge of the cd? Give

your answer in meters per second.

c. What is the linear speed of a point 3 centimeters from the center of the cd? (Assume the angular speed

has not changed).

Speed is 4 times that. That is, 150.8 cm/s or 1.508 m/s.

If we get a point at distance 3 cm, we take the radius half of that. The circumference also gets half, so does the linear speed. We get 0.754 m/s or 75.398 cm/s.