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Physics

Physics. Final Exam Review. True or False? . The horizontal component of a projectile's velocity is independent of the vertical component. Answer. TRUE.

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Physics

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  1. Physics Final Exam Review

  2. True or False? The horizontal component of a projectile's velocity is independent of the vertical component

  3. Answer TRUE

  4. After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglecting air resistance) __?___

  5. Answer • 10 m/s2 which is gravity (pulling downward)

  6. A plane flying north at 50 km/h experiences a wind 10 km/h south. What is the magnitude and direction of the plane?

  7. Answer • This is a headwind; therefore, you subtract. • The answer is 40 km/h going north

  8. A plane flying north at 50 km/h experiences a wind 10 km/h east. What is the magnitude and direction of the plane?

  9. Answer • Use Pythagorean Theorem • a2 + b2 = c2 The answer is 51 km/h northeast

  10. When an object is thrown in a curved path, what is its velocity at the top of the path?

  11. Answer • Entirely horizontal because the vertical component is zero

  12. Assuming the car starts from rest, what is the acceleration if the car has a speed of 20 m/s for 4 s?

  13. Answer Unknown a Known v = 20 m/s t = 4 s a = v/t 5 m/s2

  14. How high is a tree if an acorn falls and hits the ground in 2.25 s?

  15. Answer Unknownd = vot + ½ gt2 d Known= 0(2.25s) + ½ (10m/s2)(2.25s)2 t = 2.25 s = 0 + 5m/s2(5.0652s2) d = 25.31 m

  16. Question • When a balloon deflates, the balloon pushes on the air and _______.

  17. Answer • The air pushes on the balloon

  18. Question • A book weighs 10 N. When held at rest in your hands, the net force on the book is ____.

  19. Answer • Zero

  20. Question • As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?

  21. Answer • The pull of the ball’s mass on the Earth

  22. Question • The outside force that slows objects down or stops their motion is ___.

  23. Answer • Friction

  24. Question • What is the pressure exerted on a table by a book that weighs 35 N and covers an area of 3 m2?

  25. Answer Known F = 35 N A = 3 m2 Unknown P Equation P = F A Solve P = 35 N 3m2 P = 11.67 N/m2 or 11.67 Pa

  26. Question • A dog walks on a street. What is the force of friction between the 225 N dog and the street that has a coefficient of friction of 0.26?

  27. Answer Known w = 225 N = FN µ = 0.26 Unknown Ff = ? Equation Ff = µFN Solve Ff = µFN Ff = (0.26)(225N) Ff = 58.5 N

  28. Question • Mass and acceleration are __________________ proportional.

  29. Answer • Inversely proportional • More mass results in less acceleration • Less mass results in more acceleration

  30. Question • Pressure and Area are _______________ proportional.

  31. Answer • Inversely proportional • More area covered results in less pressure • Less area covered results in more pressure

  32. Question • Which has greater tangential speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

  33. Answer • The one on the outside because it has a larger radius

  34. ____ 1. Pressure in a liquid depends on the _____.

  35. Answer E The depth and the density

  36. Archimedes' principle says that an object is buoyed up by a force that is equal to the _____.

  37. Answer A weight of the fluid displaced

  38. What is the difference in water pressure between the top and bottom of a 100-m deep well?

  39. Answer • At the bottom the pressure is greater

  40. If you lift four loads up one step, how much work do you do compared to lifting two loads up one step.

  41. Answer • You do twice as much work W = Fd, therefore, if the distance stays the same but you lift twice as much weight, you do twice as much work

  42. What is the buoyant force of a rubber ducky floating in water that displaces 0.05 cm3 of water. (remember the density of water is 1 g/cm3)

  43. Answer Known D = 1 g/cm3 g = 10 m/s2 V = 0.05 cm3 Unknown Fb Equation Fb = DgV Solve Fb = DgV =(1g/cm3)(10m/s2)(0.05cm3) Fb = 0.5 N

  44. Draw a parallel and series circuit with three resistors. Label the resistors, wire and battery.

  45. Answer • Series Parallel wire battery

  46. The Tacoma Bridge collapsed due to the alignment of frequencies between the bridge and the wind which is called ___.

  47. Answer • Resonance

  48. Which is the angle of reflection?

  49. Which is the angle of reflection? • Angle C

  50. Which is the angle of reflection?

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