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kaylalynn Group Title

Final exam review help?!?!

  • one year ago
  • one year ago

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  1. kaylalynn Group Title
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    I have 3 study sheets.

    • one year ago
  2. kaylalynn Group Title
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    • one year ago
  3. kaylalynn Group Title
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    for # 1 i got 34km/h

    • one year ago
  4. Coolsector Group Title
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    no, you have to multiply by 3.6

    • one year ago
  5. kaylalynn Group Title
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    why?

    • one year ago
  6. Coolsector Group Title
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    |dw:1383926098747:dw|

    • one year ago
  7. kaylalynn Group Title
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    4.9 m change it to km it is 0.0049km/s * 60 *60 = 33.8

    • one year ago
  8. Coolsector Group Title
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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

    • one year ago
  9. Coolsector Group Title
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    look at my draw

    • one year ago
  10. Coolsector Group Title
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    -> 0.0049km/s * 60 *60 = 33.8 it is 17.64 and not 33.8

    • one year ago
  11. Coolsector Group Title
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    0.0049 * 60 * 60 = 17.64

    • one year ago
  12. Coolsector Group Title
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    maybe you did mistake when you enter the numbers into the calculator

    • one year ago
  13. kaylalynn Group Title
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    the options are 94,000 km/h 34 km/h 2.6 km/h 34,000,000 km/h

    • one year ago
  14. Coolsector Group Title
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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

    • one year ago
  15. Coolsector Group Title
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    0.0049 * 60 * 60 = 17.64 do it in the calculator and see

    • one year ago
  16. Coolsector Group Title
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    m is for meters right ? :O

    • one year ago
  17. kaylalynn Group Title
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    yes. Idk maybe the options are wrong. i keep getting 17.64 too.

    • one year ago
  18. Coolsector Group Title
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    i guess they are wrong

    • one year ago
  19. kaylalynn Group Title
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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?

    • one year ago
  20. Coolsector Group Title
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    well in x=1/2at^2 there is no mass

    • one year ago
  21. kaylalynn Group Title
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    would X=Ft work?

    • one year ago
  22. Coolsector Group Title
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    you have options ?

    • one year ago
  23. kaylalynn Group Title
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    yes X=Ft X=at X=vt and X=1/2at^2

    • one year ago
  24. Coolsector Group Title
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    yes Ft is the one

    • one year ago
  25. kaylalynn Group Title
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    for 3 I want to say B?

    • one year ago
  26. Coolsector Group Title
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    no

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

    • one year ago
  28. Coolsector Group Title
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    now for 3. think what happens to y when x is small and when x is big..

    • one year ago
  29. kaylalynn Group Title
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    im confused

    • one year ago
  30. Coolsector Group Title
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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 ?

    • one year ago
  31. kaylalynn Group Title
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    yes so thus my answer is A? AS X gets larger Y gets smaller.

    • one year ago
  32. Coolsector Group Title
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    yes ! A

    • one year ago
  33. kaylalynn Group Title
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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

    • one year ago
  34. kaylalynn Group Title
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    1,000 cm3?

    • one year ago
  35. Coolsector Group Title
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    i think it iscorrect

    • one year ago
  36. kaylalynn Group Title
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    Which equation represents inverse proportionality? y=mx?

    • one year ago
  37. Coolsector Group Title
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    y=mx is linear proportionality direct ..

    • one year ago
  38. kaylalynn Group Title
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    y=mx y=mx^2 +b for nonzero b y=m/x y=mx^2

    • one year ago
  39. Coolsector Group Title
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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 ...

    • one year ago
  40. kaylalynn Group Title
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    so how would that be represented by an equation?

    • one year ago
  41. Coolsector Group Title
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    y=m/x as i said we had something like this before when we chose graph A

    • one year ago
  42. kaylalynn Group Title
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    oh. okay so its like the graph.

    • one year ago
  43. kaylalynn Group Title
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    A bicycle and rider travel along a road. Which of the following statements is true?

    • one year ago
  44. kaylalynn Group Title
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    The bicycle wheels rotate and translate the entire bike and the rider.

    • one year ago
  45. Coolsector Group Title
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    please write the other options as well

    • one year ago
  46. kaylalynn Group Title
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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.

    • one year ago
  47. Coolsector Group Title
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    so your answer is correct

    • one year ago
  48. kaylalynn Group Title
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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.

    • one year ago
  49. Coolsector Group Title
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    so if you were not moving the relative speed was 0.5m/s correct?

    • one year ago
  50. kaylalynn Group Title
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    correct

    • one year ago
  51. Coolsector Group Title
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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

    • one year ago
  52. Coolsector Group Title
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    do you understand why ?

    • one year ago
  53. kaylalynn Group Title
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    because he is walking backwards at 0.8

    • one year ago
  54. Coolsector Group Title
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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

    • one year ago
  55. kaylalynn Group Title
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    okay

    • one year ago
  56. kaylalynn Group Title
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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?

    • one year ago
  57. Coolsector Group Title
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    correct

    • one year ago
  58. Coolsector Group Title
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    (650/430 = 1.5116...)

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

    • one year ago
  60. kaylalynn Group Title
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    • one year ago
  61. kaylalynn Group Title
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    not sure about this one.

    • one year ago
  62. Coolsector Group Title
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    average velocity = (y2-y1) / (t2 -t1)

    • one year ago
  63. Coolsector Group Title
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    between two points : (t1,y1) and (t2,y2)

    • one year ago
  64. kaylalynn Group Title
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    4m/s?

    • one year ago
  65. Coolsector Group Title
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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

    • one year ago
  66. kaylalynn Group Title
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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

    • one year ago
  67. Coolsector Group Title
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    you take the value of g as 9.8 ?

    • one year ago
  68. Coolsector Group Title
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    so yes correct..

    • one year ago
  69. Coolsector Group Title
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    v=gt so t=v/g now plug it into h = 0.5gt^2 = 0.5v^2/g = 18.4

    • one year ago
  70. kaylalynn Group Title
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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?

    • one year ago
  71. Coolsector Group Title
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    correct 15*4 = 60

    • one year ago
  72. kaylalynn Group Title
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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

    • one year ago
  73. kaylalynn Group Title
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    What additional force must be applied so that the block does not accelerate? 10N West?

    • one year ago
  74. kaylalynn Group Title
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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?

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

    • one year ago
  76. kaylalynn Group Title
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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?

    • one year ago
  77. kaylalynn Group Title
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    however the options are - 3.33 N - 1.50 N - 1.00 N - 4.00 N

    • one year ago
  78. Coolsector Group Title
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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.

    • one year ago
  79. Coolsector Group Title
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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.

    • one year ago
  80. kaylalynn Group Title
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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.

    • one year ago
  81. Coolsector Group Title
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    so it is right.

    • one year ago
  82. kaylalynn Group Title
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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?

    • one year ago
  83. Coolsector Group Title
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    yes

    • one year ago
  84. Coolsector Group Title
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    3.7*11

    • one year ago
  85. kaylalynn Group Title
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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?

    • one year ago
  86. kaylalynn Group Title
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    im not sure about this one

    • one year ago
  87. Coolsector Group Title
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    newton's third law..

    • one year ago
  88. Coolsector Group Title
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    another hint ?

    • one year ago
  89. kaylalynn Group Title
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    F=ma?

    • one year ago
  90. Coolsector Group Title
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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

    • one year ago
  91. kaylalynn Group Title
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    i feel stupid. sorry. ive been up all night

    • one year ago
  92. Coolsector Group Title
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    what is the force that acts on the 40kg student ?

    • one year ago
  93. Coolsector Group Title
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    dont feel stupid your answers are good

    • one year ago
  94. kaylalynn Group Title
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    3m/s?

    • one year ago
  95. Coolsector Group Title
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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

    • one year ago
  96. kaylalynn Group Title
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    2.5 m/s

    • one year ago
  97. Coolsector Group Title
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    yes (well they might have there -2.5 since it is in the other direction)

    • one year ago
  98. kaylalynn Group Title
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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?

    • one year ago
  99. kaylalynn Group Title
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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...

    • one year ago
  100. Coolsector Group Title
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    so the situation is that they are moving toward each other ? and then elastic collision ?

    • one year ago
  101. kaylalynn Group Title
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    i asume

    • one year ago
  102. Coolsector Group Title
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    correct then

    • one year ago
  103. kaylalynn Group Title
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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?

    • one year ago
  104. kaylalynn Group Title
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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

    • one year ago
  105. Coolsector Group Title
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    so what do you think ?

    • one year ago
  106. kaylalynn Group Title
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    A?

    • one year ago
  107. Coolsector Group Title
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    yes

    • one year ago
  108. Coolsector Group Title
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    newton's third law always involved two bodies

    • one year ago
  109. kaylalynn Group Title
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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?

    • one year ago
  110. kaylalynn Group Title
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    about 90N?

    • one year ago
  111. rajat97 Group Title
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    |dw:1383940674800:dw| yes the accurate answer is 86.5 newton

    • one year ago
  112. kaylalynn Group Title
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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?

    • one year ago
  113. rajat97 Group Title
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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

    • one year ago
  114. rajat97 Group Title
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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

    • one year ago
  115. kaylalynn Group Title
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    Which of these is true about an object thrown straight up in the absence of air resistance?

    • one year ago
  116. kaylalynn Group Title
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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.

    • one year ago
  117. Coolsector Group Title
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    so what do you think ?

    • one year ago
  118. kaylalynn Group Title
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    C?

    • one year ago
  119. Coolsector Group Title
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    well no does g change during the motion ?

    • one year ago
  120. kaylalynn Group Title
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    i want to say no

    • one year ago
  121. Coolsector Group Title
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    because the acceleration does not change

    • one year ago
  122. kaylalynn Group Title
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    so it would be A?

    • one year ago
  123. Coolsector Group Title
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    yes

    • one year ago
  124. Coolsector Group Title
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    note that at the maximum height the velocity is indeed zero. but what makes it go down ? the acceleration.

    • one year ago
  125. kaylalynn Group Title
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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?

    • one year ago
  126. ayhan Group Title
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    5m/sn2

    • one year ago
  127. ayhan Group Title
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    ok

    • one year ago
  128. rajat97 Group Title
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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

    • one year ago
  129. kaylalynn Group Title
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    is it + or -?

    • one year ago
  130. rajat97 Group Title
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    change in velocity is final velocity -initial vel as final vel is greater than initial vel , it will be posotive

    • one year ago
  131. rajat97 Group Title
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    and if vel is increasing, then acceleration is +ve

    • one year ago
  132. kaylalynn Group Title
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    What shape does a position vs. time graph have for an object in uniform acceleration?

    • one year ago
  133. kaylalynn Group Title
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    cubic inverse quadratic linear

    • one year ago
  134. rajat97 Group Title
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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

    • one year ago
  135. ayhan Group Title
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    hi again

    • one year ago
  136. kaylalynn Group Title
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    okay and hi

    • one year ago
  137. rajat97 Group Title
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    are your questions finished

    • one year ago
  138. ayhan Group Title
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    ok.bye

    • one year ago
  139. rajat97 Group Title
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    please inform me when your questions are finished

    • one year ago
  140. rajat97 Group Title
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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

    • one year ago
  141. kaylalynn Group Title
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    no, my mom needed help with something.

    • one year ago
  142. kaylalynn Group Title
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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?

    • one year ago
  143. kaylalynn Group Title
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    1.5N

    • one year ago
  144. Coolsector Group Title
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    correct

    • one year ago
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