Asolid cylinder with a mass of 266 kg and radius 0.070 m is rotating with an angular speed of 83.0 rad/s about an axis passing through its center and perpendicular to its end faces. the rotation of the cylinder is slowed down by a factor of 5 by applying a tangential frictional force to it for 4.90 s. what is the magnitude, in n, of the friction force applied to the cylinder?

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?