4. A 0.50-g insect rests on a compact disc at a distance of 4.0 cm from the center. The disc's rate of rotation varies from 3.5 Hz to 8.0 Hz in order to maintain a constant data sampling rate. (a) What are the insect's minimum and maximum centripetal accelerations during its rotation around the disc? (b) What is the minimum value of the coefficient of static friction that would prevent the insect from slipping off the disc at the slowest rotation rate