Calculate the centripetal acceleration ac of various objects. Yelena is driving her car on a dry, non-slippery road. The car moves forward with a speed of 31.5 m/s. What is the centripetal acceleration of the tire, which has a radius of 0.45 m? ac = m/$2 Arek is riding his bicycle on a non-slippery bike path. The wheel has a radius of 731 mm. The bike moves forward at 9.15 m/s. What is the wheel's centripetal acceleration? ac m/s2 Jolie the hamster is using his hamster wheel, which has a diameter of 22.6 cm. A point on the wheel is moving at 0.17 m/s. What is the hamster wheel's centripetal acceleration? ac = m/$2