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Physics Homework Announcements and Projectile Motion Exercises

Please join immediately using your student ID number and remember to power down the responder before returning it. Start your homework early to avoid difficulty later on. For additional resources, please check the PRS slideshows available on the schedule page. This includes a series of exercises on projectile motion involving a steel ball released from a moving flat car, comparing the heights and timing of two balls launched at different angles, and analyzing the trajectories of shells fired from a battleship.

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Physics Homework Announcements and Projectile Motion Exercises

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  1. ANNOUNCEMENTS • Join immediately. Enter your student ID number. Power down the responder before returning to the duffle. • Start homework as soon as possible (get stuck early). • See links to PRS slideshows on schedule page.

  2. 1 of 3 A person hanging onto a mast attached to the bed of a railway flat car releases a steel ball 5 m above a bucket at bed level. The car, ball, and people are all moving uniformly with speed v = 5 m/s as shown. Assume g = 10 m/s2. After it is released, the ball will (ignoring atmospheric drag): Fall 1 m behind the bucket. Fall 2 m behind the bucket. Fall 5 m behind the bucket. Fall into the bucket. v 2

  3. 2 of 3 • Ball A is thrown straight upward. Ball B is simultaneously launched at an angle above the horizontal. Both reach the same maximum altitude. Ignoring atmospheric drag, ball B comes back down (reaches the original altitude) • before ball A. • simultaneously with ball A. • after ball A. • at time relative to A that is indeterminate without knowing the angle of launch. vB B A vA path path 3

  4. 3 of 3 A battleship simultaneously fires two shells at enemy ships. If the shells follow the trajectories shown, which ship gets hit first? A Both at the same time B Need more information Eric Mazur’s Peer Instruction, Prentice Hall, 1997, p. 110. 4

  5. ANNOUNCEMENTS • Join immediately. Enter your student ID number. Power down the responder before returning to the duffle. • Start homework as soon as possible (get stuck early). • See links to PRS slideshows on schedule page. 5

  6. 1 of 3 A person hanging onto a mast attached to the bed of a railway flat car releases a steel ball 5 m above a bucket at bed level. The car, ball, and people are all moving uniformly with speed v = 5 m/s as shown. Assume g = 10 m/s2. After it is released, the ball will (ignoring atmospheric drag): Fall 1 m behind the bucket. Fall 2 m behind the bucket. Fall 5 m behind the bucket. Fall into the bucket. v 6

  7. 2 of 3 • Ball A is thrown straight upward. Ball B is simultaneously launched at an angle above the horizontal. Both reach the same maximum altitude. Ignoring atmospheric drag, ball B comes back down (reaches the original altitude) • before ball A. • simultaneously with ball A. • after ball A. • at time relative to A that is indeterminate without knowing the angle of launch. vB B A vA path path 7

  8. 3 of 3 A battleship simultaneously fires two shells at enemy ships. If the shells follow the trajectories shown, which ship gets hit first? A Both at the same time B Need more information Eric Mazur’s Peer Instruction, Prentice Hall, 1997, p. 110. 8

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