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# Assign2 - PHY 53 Summer 2010 Assignment 2 Reading...

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Assignment 2 Reading: Kinematics 2 Key Concepts: Projectiles; circular motion. [In problems with numbers, use g = 10 m/s 2 .] 1. Ball A and ball B are thrown with the same vertical component of initial velocity, but ball A is thrown at a 30° angle above the horizontal and ball B at a 60° angle. They both land at the level from which they were thrown. Neglect air resistance. Comment on the validity of each statement, and give your reasoning. a. Ball B stays in the air longer. b. The balls will travel the same distance horizontally before landing. c. Ball B will rise higher. d. Ball A will land with the greater speed. 2. A ball on a string is moving with constant speed v in a circle of radius R on a horizontal surface. As shown from above, the ball is at the location shown. Comment on the validity of each statement, and give your reasoning. a. The ball’s acceleration is v 2 / R to the right. b. If the string breaks at this instant, the ball will move off to the right. c. The tangential acceleration of the ball is zero. d. Because the ball’s speed is constant, there is no acceleration. 3.

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Assign2 - PHY 53 Summer 2010 Assignment 2 Reading...

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