9) The massless rod is 1.6 m long, and the masses are 3.0 kg each. Find the rotational inertia of the rod as it spins about its midpoint. How could you increase the rotational inertia?

7. A bicyclist starting at rest produces a constant angular acceleration of 1.70 rad/s2 for wheels that are 34.0 cm in radius. (a) What is the bicycle's linear acceleration (in m/s2)? (Enter the magnitude.) (b) What is the angular speed of the wheels (in rad/s) when the bicyclist reaches 11.2 m/s? (c) How many radians have the wheels turned through in that time? (d) How far (in m) has the bicycle traveled?

A constant horizontal force of 10 N is applied to a wheel of mass = 10 kg and radius of 0.3 m. The center of mass of the wheel has an acceleration of 0.48 m/s/s.   a) Determine the magnitude of the friction force acting on the wheel. b) Determine the magnitude of the rotational inertia if the linear acceleration were 0.48 m/s/s. You will have to recalculate the friction force.

18) Consider an adult and a child riding their bikes. The adult's bicycle has tires with an outer diameter of 700 centimeters. The child's bicycle has tires with an outer diameter of 350 centimeters. The adult bicycle's tires are rotating with an angular velocity of 4.0 radians per second. If the child cyclist is traveling along the road at the same speed as the adult, then what angular velocity must the child's bicycle's tires be rotating at? [Assume the tires are rotating without slipping as the cyclists ride]. A) 1.0 radians second per B) 2.0 radians per second C) 4.0 radians per second D) 8.0 radians per second E) 16.0 radians per second abnoose e G