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kaylalynn

Final exam review help?!?!

  • 5 months ago
  • 5 months ago

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  1. kaylalynn
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    I have 3 study sheets.

    • 5 months ago
  2. kaylalynn
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    • 5 months ago
  3. kaylalynn
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    for # 1 i got 34km/h

    • 5 months ago
  4. Coolsector
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    no, you have to multiply by 3.6

    • 5 months ago
  5. kaylalynn
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    why?

    • 5 months ago
  6. Coolsector
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    |dw:1383926098747:dw|

    • 5 months ago
  7. kaylalynn
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    4.9 m change it to km it is 0.0049km/s * 60 *60 = 33.8

    • 5 months ago
  8. Coolsector
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    4.9 m change it to km it is 0.0049km this is correct. but then when you change seconds into hours you divide by 3600 since you divide it in the denominator it is like multiplying by 3600 so eventually 0.0049 * 3600 = 17.64 km/h

    • 5 months ago
  9. Coolsector
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    look at my draw

    • 5 months ago
  10. Coolsector
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    -> 0.0049km/s * 60 *60 = 33.8 it is 17.64 and not 33.8

    • 5 months ago
  11. Coolsector
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    0.0049 * 60 * 60 = 17.64

    • 5 months ago
  12. Coolsector
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    maybe you did mistake when you enter the numbers into the calculator

    • 5 months ago
  13. kaylalynn
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    the options are 94,000 km/h 34 km/h 2.6 km/h 34,000,000 km/h

    • 5 months ago
  14. Coolsector
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    well what can i say : http://www.unitconversion.org/velocity/meters-per-second-to-kilometers-per-hour-conversion.html you may check yourself here

    • 5 months ago
  15. Coolsector
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    0.0049 * 60 * 60 = 17.64 do it in the calculator and see

    • 5 months ago
  16. Coolsector
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    m is for meters right ? :O

    • 5 months ago
  17. kaylalynn
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    yes. Idk maybe the options are wrong. i keep getting 17.64 too.

    • 5 months ago
  18. Coolsector
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    i guess they are wrong

    • 5 months ago
  19. kaylalynn
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    A physical quantity X depends on mass, distance, and time. Use dimensional analysis to decide which of these is a possible expression for X where a is acceleration, v is velocity, and F is force. It's either X=Ft or X=1/2at^2 right?

    • 5 months ago
  20. Coolsector
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    well in x=1/2at^2 there is no mass

    • 5 months ago
  21. kaylalynn
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    would X=Ft work?

    • 5 months ago
  22. Coolsector
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    you have options ?

    • 5 months ago
  23. kaylalynn
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    yes X=Ft X=at X=vt and X=1/2at^2

    • 5 months ago
  24. Coolsector
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    yes Ft is the one

    • 5 months ago
  25. kaylalynn
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    for 3 I want to say B?

    • 5 months ago
  26. Coolsector
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    no

    • 5 months ago
  27. Coolsector
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    (just to make sure that you understand Ft units are [kg m / s] so it has mass distance and time)

    • 5 months ago
  28. Coolsector
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    now for 3. think what happens to y when x is small and when x is big..

    • 5 months ago
  29. kaylalynn
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    im confused

    • 5 months ago
  30. Coolsector
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    y = k/x for low values of x like when x goes to zero y will be very large for high values of x like when x goes to infinity y will be very low agree ?

    • 5 months ago
  31. kaylalynn
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    yes so thus my answer is A? AS X gets larger Y gets smaller.

    • 5 months ago
  32. Coolsector
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    yes ! A

    • 5 months ago
  33. kaylalynn
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    A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3

    • 5 months ago
  34. kaylalynn
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    1,000 cm3?

    • 5 months ago
  35. Coolsector
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    i think it iscorrect

    • 5 months ago
  36. kaylalynn
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    Which equation represents inverse proportionality? y=mx?

    • 5 months ago
  37. Coolsector
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    y=mx is linear proportionality direct ..

    • 5 months ago
  38. kaylalynn
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    y=mx y=mx^2 +b for nonzero b y=m/x y=mx^2

    • 5 months ago
  39. Coolsector
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    we had one like this before .. we want inverse so when one is high the other is low and when one is low the other is high ...

    • 5 months ago
  40. kaylalynn
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    so how would that be represented by an equation?

    • 5 months ago
  41. Coolsector
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    y=m/x as i said we had something like this before when we chose graph A

    • 5 months ago
  42. kaylalynn
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    oh. okay so its like the graph.

    • 5 months ago
  43. kaylalynn
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    A bicycle and rider travel along a road. Which of the following statements is true?

    • 5 months ago
  44. kaylalynn
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    The bicycle wheels rotate and translate the entire bike and the rider.

    • 5 months ago
  45. Coolsector
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    please write the other options as well

    • 5 months ago
  46. kaylalynn
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    Only the bicycle rider undergoes a translation. The bicycle wheels rotate and translate the entire bike and the rider. Only the bicycle undergoes a translation. Neither the bicycle nor the rider undergoes a translation.

    • 5 months ago
  47. Coolsector
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    so your answer is correct

    • 5 months ago
  48. kaylalynn
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    Suppose you are on a conveyor belt walkway at an airport. The walkway is moving at 0.50 m/s. You walk backward at 0.80 m/s to hand your suitcase to a friend who is 3.0 m behind you. A security guard stands alongside the walkway watching this. What is your speed relative to the guard? im not sure how to do this one.

    • 5 months ago
  49. Coolsector
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    so if you were not moving the relative speed was 0.5m/s correct?

    • 5 months ago
  50. kaylalynn
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    correct

    • 5 months ago
  51. Coolsector
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    now i guess the 0.8m/s walking backwards is relative to the belt! so we have: 0.5 - 0.8

    • 5 months ago
  52. Coolsector
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    do you understand why ?

    • 5 months ago
  53. kaylalynn
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    because he is walking backwards at 0.8

    • 5 months ago
  54. Coolsector
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    yes. not moving on the belt : 0.5 moving forward on the belt at x : 0.5 + x moving backward on the belt at x: 0.5 -x

    • 5 months ago
  55. kaylalynn
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    okay

    • 5 months ago
  56. kaylalynn
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    An airplane travels southwest a distance of 650 km at a velocity of 430 km/h. How long does the trip take in hours? 1.5?

    • 5 months ago
  57. Coolsector
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    correct

    • 5 months ago
  58. Coolsector
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    (650/430 = 1.5116...)

    • 5 months ago
  59. kaylalynn
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    On the position-time graph, what is the average velocity between 5 s and 10 s?

    • 5 months ago
  60. kaylalynn
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    • 5 months ago
  61. kaylalynn
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    not sure about this one.

    • 5 months ago
  62. Coolsector
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    average velocity = (y2-y1) / (t2 -t1)

    • 5 months ago
  63. Coolsector
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    between two points : (t1,y1) and (t2,y2)

    • 5 months ago
  64. kaylalynn
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    4m/s?

    • 5 months ago
  65. Coolsector
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    at 5 sec the height is 10 so (5,10) and at 10 sec the height is 30 so (10,30) (30-10) / (10-5) = 4 correct

    • 5 months ago
  66. kaylalynn
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    A ball is dropped from a tower. It strikes the ground with a speed of +19.0 m/s. How high is the tower? 18.4m

    • 5 months ago
  67. Coolsector
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    you take the value of g as 9.8 ?

    • 5 months ago
  68. Coolsector
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    so yes correct..

    • 5 months ago
  69. Coolsector
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    v=gt so t=v/g now plug it into h = 0.5gt^2 = 0.5v^2/g = 18.4

    • 5 months ago
  70. kaylalynn
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    A ship travels south at 15 km/h for 4 h. What is the ship's displacement in km? 60km South?

    • 5 months ago
  71. Coolsector
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    correct 15*4 = 60

    • 5 months ago
  72. kaylalynn
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    A ball is rolling down a hill at +2.0 m/s. The ball is uniformly accelerating at +4.0 m/s2. What will the ball's velocity be 3.0 s later? 14m/s because v=u+at

    • 5 months ago
  73. kaylalynn
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    What additional force must be applied so that the block does not accelerate? 10N West?

    • 5 months ago
  74. kaylalynn
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    A 1,560 kg car is accelerating at 1.30 m/s2. What net force acts on the car? F=ma so 2028 rounds to 2030?

    • 5 months ago
  75. kaylalynn
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    Which statement is equivalent to Newton's first law? No net force acting on an object means no acceleration.

    • 5 months ago
  76. kaylalynn
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    A tension force of 2.50 N acts horizontally on a 2.00 kg block. The block accelerates at 0.750 m/s2. What is the force of kinetic friction? 1N?

    • 5 months ago
  77. kaylalynn
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    however the options are - 3.33 N - 1.50 N - 1.00 N - 4.00 N

    • 5 months ago
  78. Coolsector
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    ball - correct block - correct car - correct newtons first law - seems like it is correct but it is better to see the other options tension - it is -1 (remember that the kinetic friction force is against the direction of the motion) so you right about the magnitude but the sign is there to show what is the direction.

    • 5 months ago
  79. Coolsector
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    i guess that you solved it like 2.5 - Fk = ma and then you got Fk =1 but look at the equation - you already chose the direction with the minus sign.

    • 5 months ago
  80. kaylalynn
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    No net force acting on an object means no acceleration. For every action there is an equal and opposite reaction. Mass is directly proportional to weight. The acceleration of an object is the net force acting on it divided by its mass.

    • 5 months ago
  81. Coolsector
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    so it is right.

    • 5 months ago
  82. kaylalynn
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    The acceleration due to gravity on the surface of Mars is gmars = 3.7 m/s2. How much would an 11 kg bag of potatoes weigh on Mars? 41N?

    • 5 months ago
  83. Coolsector
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    yes

    • 5 months ago
  84. Coolsector
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    3.7*11

    • 5 months ago
  85. kaylalynn
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    The 48 kg student on skates pushes the 40 kg student on skates. The 40 kg student accelerates at 3.0 m/s2. What is the acceleration of the 48 kg student?

    • 5 months ago
  86. kaylalynn
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    im not sure about this one

    • 5 months ago
  87. Coolsector
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    newton's third law..

    • 5 months ago
  88. Coolsector
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    another hint ?

    • 5 months ago
  89. kaylalynn
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    F=ma?

    • 5 months ago
  90. Coolsector
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    newton's third says that if body A push body B with force F then body B push body A with the same force F in the opposite direction

    • 5 months ago
  91. kaylalynn
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    i feel stupid. sorry. ive been up all night

    • 5 months ago
  92. Coolsector
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    what is the force that acts on the 40kg student ?

    • 5 months ago
  93. Coolsector
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    dont feel stupid your answers are good

    • 5 months ago
  94. kaylalynn
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    3m/s?

    • 5 months ago
  95. Coolsector
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    i asked about the force The 40 kg student accelerates at 3.0 m/s2 so the force on him is 40 * 3 = 120 N now according to newton's third law it is the force that acts on the second student as well (in the other direction) so 120 = 48 * a a = 120 / 48

    • 5 months ago
  96. kaylalynn
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    2.5 m/s

    • 5 months ago
  97. Coolsector
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    yes (well they might have there -2.5 since it is in the other direction)

    • 5 months ago
  98. kaylalynn
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    A 0.156 kg ice puck collides with a 0.170 kg ice puck. Both were originally moving at the same speed. Which one has the larger change in velocity?

    • 5 months ago
  99. kaylalynn
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    The 0.156 kg puck changes velocity the most. The 0.170 kg puck changes velocity the most. They both have the same change in velocity. They each have no change in velocity. I say it is the first one...

    • 5 months ago
  100. Coolsector
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    so the situation is that they are moving toward each other ? and then elastic collision ?

    • 5 months ago
  101. kaylalynn
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    i asume

    • 5 months ago
  102. Coolsector
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    correct then

    • 5 months ago
  103. kaylalynn
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    A diver jumps down on a springboard, bounces back up, and dives into the pool. Which of these is one of the action-reaction pairs involved?

    • 5 months ago
  104. kaylalynn
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    the force on the board as the diver bends it downward and the force on the diver as the board springs back up the force of the board on the diver as he moves down and the force of the board on the diver when pushed back up the springiness of the board in moving back up the force the diver exerts on the water and the force the water exerts on the diver

    • 5 months ago
  105. Coolsector
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    so what do you think ?

    • 5 months ago
  106. kaylalynn
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    A?

    • 5 months ago
  107. Coolsector
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    yes

    • 5 months ago
  108. Coolsector
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    newton's third law always involved two bodies

    • 5 months ago
  109. kaylalynn
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    A force of 100 N acts in a direction at an angle of 30° with the x-axis. What is the magnitude of the x component of the force?

    • 5 months ago
  110. kaylalynn
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    about 90N?

    • 5 months ago
  111. rajat97
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    |dw:1383940674800:dw| yes the accurate answer is 86.5 newton

    • 5 months ago
  112. kaylalynn
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    Two movers are pushing a large crate along the ground, one with a force of 30 N east and the other with a force of 40 N north. The crate does not move. What is the magnitude of the force of static friction?

    • 5 months ago
  113. rajat97
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    always remember for ease of resolving the forces into perpendicular directions, the component of force near the angle is the force x cos theta and the one which is away from it is f x sin theta

    • 5 months ago
  114. rajat97
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    |dw:1383940923978:dw| the forces are perpendicular so the resultant is \[\sqrt{F1^{2}+F2^{2}}\] therefore the resultant is 50N and the force of friction is equal to it

    • 5 months ago
  115. kaylalynn
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    Which of these is true about an object thrown straight up in the absence of air resistance?

    • 5 months ago
  116. kaylalynn
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    Its acceleration is constant. The direction of its velocity is constant. Its acceleration and velocity are both momentarily zero at maximum height. Its acceleration increases as it falls.

    • 5 months ago
  117. Coolsector
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    so what do you think ?

    • 5 months ago
  118. kaylalynn
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    C?

    • 5 months ago
  119. Coolsector
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    well no does g change during the motion ?

    • 5 months ago
  120. kaylalynn
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    i want to say no

    • 5 months ago
  121. Coolsector
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    because the acceleration does not change

    • 5 months ago
  122. kaylalynn
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    so it would be A?

    • 5 months ago
  123. Coolsector
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    yes

    • 5 months ago
  124. Coolsector
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    note that at the maximum height the velocity is indeed zero. but what makes it go down ? the acceleration.

    • 5 months ago
  125. kaylalynn
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    The velocity of an object increases from 5.0 m/s to 15 m/s in 2.0 s. What is the average acceleration of the object?

    • 5 months ago
  126. ayhan
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    5m/sn2

    • 5 months ago
  127. ayhan
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    ok

    • 5 months ago
  128. rajat97
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    i'm on it average velocity is change in velocity in unit time so here it is 15-5/2 =5m/s^2

    • 5 months ago
  129. kaylalynn
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    is it + or -?

    • 5 months ago
  130. rajat97
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    change in velocity is final velocity -initial vel as final vel is greater than initial vel , it will be posotive

    • 5 months ago
  131. rajat97
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    and if vel is increasing, then acceleration is +ve

    • 5 months ago
  132. kaylalynn
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    What shape does a position vs. time graph have for an object in uniform acceleration?

    • 5 months ago
  133. kaylalynn
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    cubic inverse quadratic linear

    • 5 months ago
  134. rajat97
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    i think its cubic as the degree of the equation increases as we move towards position time graph i mean to say its linear in v-t graph so it may be quadratic in x-t graph

    • 5 months ago
  135. ayhan
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    hi again

    • 5 months ago
  136. kaylalynn
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    okay and hi

    • 5 months ago
  137. rajat97
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    are your questions finished

    • 5 months ago
  138. ayhan
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    ok.bye

    • 5 months ago
  139. rajat97
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    please inform me when your questions are finished

    • 5 months ago
  140. rajat97
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    somethings gotta go wrong with openstudy well i live in india and its 2:45 am and i think i shall sleep now but if you have any questions please post them i'm onine for 15 mins

    • 5 months ago
  141. kaylalynn
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    no, my mom needed help with something.

    • 5 months ago
  142. kaylalynn
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    A book is being pushed along a table at constant speed. The coefficient of static friction is 0.75, and the coefficient of kinetic friction is 0.30. The book has a mass of 0.50 kg. What is the force of friction?

    • 5 months ago
  143. kaylalynn
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    1.5N

    • 5 months ago
  144. Coolsector
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    correct

    • 5 months ago
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