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topic here. Gravity. Centripetal Force. Circular Motion. Roller Coasters. Physics is Phun!. Gravity. Centripetal. Circular. Coasters. Physics is Phun!. 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt.

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  1. topic here

  2. Gravity

  3. Centripetal Force

  4. Circular Motion

  5. Roller Coasters

  6. Physics is Phun!

  7. Gravity Centripetal Circular Coasters Physics is Phun! 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt.

  8. At the top of its flight, a projectile has an acceleration of…? 5 pt.

  9. At the top of its flight, a projectile has an acceleration of…? 9.8 m/s2 - Downward (or -9.8 m/s2) 5 pt.

  10. An object with a mass of 23kg has a weight of what? 10 pt.

  11. An object with a mass of 23kg has a weight of what? 230 N (or 225.4 N) 10 pt.

  12. What is the value of G? 15 pt.

  13. What is the value of G? 6.67 E-11 Nm2kg2 15 pt.

  14. What is the value of g on a planet with a mass of 4 E23 kg and a diameter of 8,000 km? 20 pt.

  15. What is the value of g on a planet with a mass of 4 E23 kg and a diameter of 8,000 km? g = G m/r2 g = 6.67 E-11 Nm2kg2 * 4 E23 kg (4,000,000 m)2 g = 1.67 m/s2 20 pt.

  16. An astronaut weighs 700N on Earth. If the astronaut weighs 200N on another planet, which has a radius of 5000 km, what is the mass of the planet? 25 pt.

  17. An astronaut weighs 700N on Earth. If the astronaut weighs 200N on another planet, which has a radius of 5000 km, what is the mass of the planet? mastronaut = 70 kg Fg = 200 N = Gm1m2/r2 200N = 6.67 E-11 * 70kg * mplanet (5,000,000 m)2 mplanet = 1.07 E 24 kg 25 pt.

  18. What is the equation for Centripetal Force? 5 pt.

  19. What is the equation for Centripetal Force? Fc = mv2 / r 5 pt.

  20. What is the equation for Centripetal Acceleration? 10 pt.

  21. What is the equation for Centripetal Acceleration? ac = v2 / r 10 pt.

  22. 2-15 A 1000kg race car goes around a 200m diameter track at 50m/s. How much frictional force is needed to prevent skidding? 15 pt.

  23. 2-15A A 1000kg race car goes around a 200m diameter track at 50m/s. How much frictional force is needed to prevent skidding? Fc = mv2 / r Ff = 1000kg*(50m/s)2 / 100m Ff = 25,000 N 15 pt.

  24. 2-20 A race car goes around a 100m diameter track at 100m/s. What coefficient of friction is needed to prevent skidding? Is this Static, or Kinetic friction? 20 pt.

  25. 2-20A A race car goes around a 100m diameter track at 100m/s. What coefficient of friction is needed to prevent skidding? Is this Static, or Kinetic friction? Ff = mv2 / r FN = mg μ = Ff / FN μ = (mv2/r)/(mg) = v2/rg μ = 20 .. Static 20 pt.

  26. 2-25 Your Team may wager from 0-50 pts. Type question here. Adjust size & position as necessary. You must make your wager BEFORE the Daily Double in revealed!!! 25 pt.

  27. 2-25A Daily Double Daily Double A 0.1kg toy airplane flies around a pole, tied to a string, in a 0.5m radius circle. If the plane takes 2 seconds to circle, what is the angle between string and pole? Tan Ө = Fc / Fg Tan Ө= mv2 / rmg Tan Ө = v2 / rg = (2r/T)2 / rg Ө= Tan-1 (42r/(g T2)) T = 26o Daily Double

  28. 3-5 A ball is spun on a 2m string, completing a circle in 1 second. What is the velocity of the ball? 5 pt.

  29. 3-5A A ball is spun on a 2m string, completing a circle in 1 second. What is the velocity of the ball? v = d / t d = 2r v = 2r / t v = 12.6 m/s 5 pt.

  30. 3-10 A ball on a string is spun in a circle, rolling along on the surface of a table-top. Draw a Free-Body diagram for the ball. 10 pt.

  31. 3-10A A ball on a string is spun in a circle, rolling along on the surface of a table-top. Draw a Free-Body diagram for the ball. FN Ft Fg 10 pt.

  32. A ball on a string is spun in a circle, moving faster and faster. Draw a pair of vectors representing the acceleration(s) of the ball.. 15 pt.

  33. A ball on a string is spun in a circle, moving faster and faster. Draw a pair of vectors representing the acceleration(s) of the ball.. at ac 15 pt.

  34. 3-20 A toy plane on a string hangs from the ceiling, flying around every 1.93 seconds. If the string has a length of 1m, and the string is 20o from the vertical, what is the centripetal acceleration of the plane? 20 pt.

  35. 3-20A A toy plane on a string hangs from the ceiling, flying around every 1.93 seconds. If the string has a length of 1m, and the string is 20o from the vertical, what is the centripetal acceleration of the plane? ac = v2 / r ac = (2r / T)2 / r ac = 42r / T2 ac = 42(1 sin20) / (1.93 s)2 ac = 3.6 m/s2 20 pt.

  36. 3-25 A toy airplane hangs from a 1m string attached to the ceiling. The plane flies in a circle of radius 0.5m. How long does it take the plane to circle once? 25 pt.

  37. 3-25A A toy airplane hangs from a 1m string attached to the ceiling. The plane flies in a circle of radius 0.5m. How long does it take the plane to circle once? ac = v2 / r Ө = 30o Tan Ө= ac / g ac = 5.77m/s2 = v2/0.5m v = 1.7 m/s d = 3.14 T = 1.85s 25 pt.

  38. 4-5 Draw a Free-Body diagram for a roller coaster on a slow hill. 5 pt.

  39. 4-5A Draw a Free-Body diagram for a roller coaster on a slow hill. FN Fg 5 pt.

  40. 4-10 Draw a Free-Body diagram for a roller coaster at the bottom of a loop (to scale). 10 pt.

  41. Draw a Free-Body diagram for a roller coaster at the bottom of a loop (to scale). FN Fg 10 pt.

  42. Draw a Free-Body diagram for a roller coaster at the top of a loop, where the rider feels weightless (to scale). 15 pt.

  43. Draw a Free-Body diagram for a roller coaster at the top of a loop, where the rider feels weightless (to scale). Fg 15 pt.

  44. How fast must a roller coaster be moving if the rider is to feel weightless at the top of the 40m tall loop? 20 pt.

  45. How fast must a roller coaster be moving if the rider is to feel weightless at the top of the 40m tall loop? FN + Fg = mv2 / r 0 N + mg = mv2 / r 10 = v2 / 20m v = 14.14 m/s 20 pt.

  46. How fast is a roller coaster moving if the rider feels 4g’s at the bottom of the 20m tall loop? 25 pt.

  47. How fast is a roller coaster moving if the rider feels 4g’s at the bottom of the 20m tall loop? FN - Fg = mv2 / r 4g’s means FN = m*4*10m/s2 m4*10 - mg = mv2 / r 40 – 10 = v2 / 10m v = 17.32 m/s 25 pt.

  48. 5-5 How many Earths would fit in Jupiter’s large red-spot? 5 pt.

  49. 5-5A How many Earths would fit in Jupiter’s large red-spot? Approximately 2 or 3 Earths would fit in the red spot. 5 pt.

  50. How many of your body cells die each day? 10 pt.

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