Lecture Note, GS/Sp2014

Example A boy at A wishes to throw two balls to the boy at B so that they arrive at the same time. If each ball is thrown with a speed of 10 m/s, determine the angles c and d at which each ball should be thrown and the time between each throw. (Ref. Engineering Mechanics, Dynamics, by R.C. Hibbeler, Prentice Hall, 2010).

Lecture Note, GS/Sp2014

Example A boy rides a skateboard on the concrete surface of an empty drainage canal described by the equation shown. He starts at y = 20 ft, and the magnitude of his velocity is approximated by ( )( ) sfty202.322v = .

(a) Determine the instantaneous radius of curvature of the boys path when he reaches the bottom.

(b) What is the normal component of his acceleration when he reaches the bottom? (Ref. Engineering Mechanics: Dynamics, by A. Bedford and W. Fowler, Prentice Hall, 2008).

Scanned from a Xerox Multifunction Device-1Particle Kinematics-5_Example-4Scanned from a Xerox Multifunction Device-2Particle Kinematics-6_Example-5