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PH 211 Winter 2014

PH 211 Winter 2014. Wednesday March 5. FINAL EXAM. We are one section, so not a group final! Monday March 17 at 18:00 (6pm) WNGR 151 A-J GLFN AUD K-Z. Google moderator. Which topic would you like to discuss in class on Friday? http://www.google.com/moderator/#16/e=20f6c5.

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PH 211 Winter 2014

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  1. PH 211 Winter 2014 Wednesday March 5

  2. FINAL EXAM • We are one section, so not a group final! • Monday March 17 at 18:00 (6pm) • WNGR 151 A-J • GLFN AUD K-Z

  3. Google moderator Which topic would you like to discuss in class on Friday? http://www.google.com/moderator/#16/e=20f6c5

  4. Google moderator Which topic would you like to discuss in class on today? http://www.google.com/moderator/#16/e=214d73

  5. Kinetic energy

  6. Gravitational potential energy Conservation of mechanical energy

  7. A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom. To achieve a speed 2v at the bottom, how many times as high must a new ramp be? • 1 • 2 • 3 • 4 • 5 • 6

  8. A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom. To achieve a speed 2v at the bottom, how many times as high must a new ramp be? • 1 • 2 • 3 • 4 • 5 • 6 0 of 207 1

  9. A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom. To achieve a speed 2v at the bottom, how many times as high must a new ramp be? • 1 • 2 • 3 • 4 • 5 • 6 h times 4 v times 2

  10. Driving a car Car A drives at 50 m/hr and car B at 70 m/hr. They both run into a brick wall and come to a full stop. The amount of damage done to car B compared to car A is roughly: • The same. • 7/5 times greater. • Twice as much. • More information is needed.

  11. Car A drives at 50 m/hr and car B at 70 m/hr. They both run into a brick wall and come to a full stop. The amount of damage done to car B compared to car A is roughly: • The same. • 7/5 times greater. • Twice as much. • More information is needed. 0 of 207 29

  12. m,v M

  13. m,v M Assume most damage is done to the car: ratio (7/5)2 or about 2

  14. Where is the speed largest? B C A E D

  15. Where is the speed largest? • A • B • C • D • E 139 of 207 1

  16. Where is the speed largest? Ug(x) Kinetic energy Total energy B C A E D

  17. Pendulum, length L, what is the angle? θ=θ0 θ=θ0 θ=θ0/√2 θ=θ0/2 θ=θ0/4 None of these θ=0 θ=θH Start, v=0 Half, v=½vB Bottom, v=vB

  18. What is the angle for which the speed is half the maximal speed? • θ=θ0 • θ=θ0 /√2 • θ=θ0 /2 • θ=θ0 /4 • None of these 0 of 207 1

  19. Find the velocities after the collision, no spin. 45°

  20. Elastic collision: all energy remains in the form of kinetic energy. Total KE before equals total KE after. Are the collisions on the pool table elastic?

  21. Momentum Conservation Impulse information Energy conservation

  22. Momentum and Impulse Information Total Energy Information

  23. As always, v=0 solution. No true collision. 90°

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