College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 24

A steel ball rolls down an incline into a loop-the- loop of radius R (Fig. a). (a) What minimum speed must the ball have at the top of the loop in order to stay on the track (b) At what vertical height ( h ) on the incline, in terms of the radius of the loop, must the ball be released in order for it to have the required minimum speed at the top of the loop (Neglect frictional losses.) (c) Figure b shows the loop-the-loop of a roller coaster. What are the sensations of the riders if the roller coaster has the minimum speed or a greater speed at the top of the loop [ Hint : hi case the speed is below the minimum, seat and shoulder straps hold the riders in.]


FIGURE Loop-the-loop and rotational speed See Exercise.