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ANNOUNCEMENTS - PowerPoint PPT Presentation

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ANNOUNCEMENTS

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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