At takeoff a commercial jet has a 45.0 m/s speed. Its tires have a diameter of 0.850 m.

(a) At how many rpm are the tires rotating?

Incorrect: Your answer is incorrect.
rpm
(b) What is the centripetal acceleration at the edge of the tire?

4764.70

Correct: Your answer is correct.
m/s2
(c) With what force must a determined 10-15 kg bacterium cling to the rim?

N
(d) Take the ratio of this force to the bacterium's weight.

(force from part (c) / bacterium's weight)