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AravindG

  • 4 years ago

doubts on newton laws of motion

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  1. AravindG
    • 4 years ago
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    k thx for cming

  2. AravindG
    • 4 years ago
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    how many types of inertia are there?

  3. AravindG
    • 4 years ago
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    easmore?

  4. anonymous
    • 4 years ago
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    Typically, we consider two. That associated with linear motion and that associated with rotational motion.

  5. AravindG
    • 4 years ago
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    oh i was asking like inertia of rest ,inertia of motion,inertia of direction etc

  6. anonymous
    • 4 years ago
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    They are all the same. Inertia is simply a measure of how an object resists a change in motion.

  7. AravindG
    • 4 years ago
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    hmm. can u xplain inertia of direction and based on tht reason this: wheels of vehicles are provided with mudguards

  8. anonymous
    • 4 years ago
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    The mud has a tendency to always maintain the same direction of travel. Eventually, this tendency exceeds the forces acting on the mud by the tire. When this happens, the mud will leave the tire in a tangential manner.

  9. AravindG
    • 4 years ago
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    doubt 2:a body of mass 2kg moves with an acceleration of 3 m/s^2 find change in momentum in in one second

  10. AravindG
    • 4 years ago
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    y is it the answer force ma?

  11. anonymous
    • 4 years ago
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    That is the definition of Newton's Second Law. \[F = {d \vec p \over dt}\]

  12. AravindG
    • 4 years ago
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    doubt 3:what is average force?

  13. anonymous
    • 4 years ago
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    \[F_{avg} = {\Delta \vec p \over \Delta t}\]

  14. AravindG
    • 4 years ago
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    doubt 4:A shell explodes in mid air into 2 equal fragments.what is direction of motion of 2 particles .explain this

  15. anonymous
    • 4 years ago
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    This is a result of internal forces only. Since Newton's Second Law considers only external forces, there are couple inferences we can draw. Let's assume the shell is at rest when it explodes. First, the center of mass of the two particles will remain at the same point in space. Second, the net momentum of the two particles will equal zero (because the object is initially at rest).

  16. AravindG
    • 4 years ago
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    can u xplain more i am cnfused

  17. anonymous
    • 4 years ago
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    The exact direction and nature of the motion of the two particles after the explosion is dependent on the nature of the explosion force.

  18. AravindG
    • 4 years ago
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    hw can we make such an assumption

  19. AravindG
    • 4 years ago
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    y dont we consider gravity as external force?

  20. AravindG
    • 4 years ago
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    ?

  21. anonymous
    • 4 years ago
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    Gravity can be considered. The center of mass of the two particles will follow the path prescribed by the external forces.

  22. anonymous
    • 4 years ago
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    This is definitely classical mechanics.

  23. AravindG
    • 4 years ago
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    eashmore?

  24. anonymous
    • 4 years ago
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    Yes?

  25. AravindG
    • 4 years ago
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    xplain

  26. anonymous
    • 4 years ago
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    What are you confused about?

  27. anonymous
    • 4 years ago
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    Let's keep things simple for now. Air resistance will change things.

  28. AravindG
    • 4 years ago
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    wel wat is direction of motion

  29. anonymous
    • 4 years ago
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    The motion of the individual particles is dependent on the nature of the explosion. The center of mass however, will have motion as described by external forces.

  30. AravindG
    • 4 years ago
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    my text says they move in opp directions

  31. AravindG
    • 4 years ago
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    for cinservation of momentum

  32. anonymous
    • 4 years ago
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    Their net momentum after the explosion must equal the momentum of the shell before explosion. Because momentum is a vector quantity, they will travel away from each other (i.e. their velocities will have opposite signs).

  33. AravindG
    • 4 years ago
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    we assume it was at rest??

  34. anonymous
    • 4 years ago
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    Let's take the simplest example. Take the shell to be on the ground, which is smooth. After the explosion the net momentum will be zero.

  35. AravindG
    • 4 years ago
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    mth3v4 pls dont mess around

  36. anonymous
    • 4 years ago
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    If the shell is in motion. The net momentum of the two particles will equal the momentum of the shell before the explosion.

  37. AravindG
    • 4 years ago
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    k

  38. AravindG
    • 4 years ago
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    hw do we recognize an internal force ?? u see i am vonfused with that

  39. anonymous
    • 4 years ago
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    I already established this as being classical mechanics. Please don't comment if you don't have anything valuable to add.

  40. anonymous
    • 4 years ago
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    I don't understand the question Aravind

  41. AravindG
    • 4 years ago
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    wel u see an example like i hav a fan kept in a boat

  42. AravindG
    • 4 years ago
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    then i turn the fan on facing the sail

  43. anonymous
    • 4 years ago
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    Nvm. I understand. An internal force is one that does not mechanical energy of a system.

  44. AravindG
    • 4 years ago
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    the boat doesnt move

  45. anonymous
    • 4 years ago
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    An internal force is one that does not change the mechanical energy of a system.

  46. AravindG
    • 4 years ago
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    hw do we recognize that . u seei thought he wind from fan can move the boat

  47. anonymous
    • 4 years ago
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    Newton's Third Law. The fan pushes the wind against the sail, but the wind pushes back on the fan. Since the fan and sail are coupled by the boat, the boat doesn't move.

  48. AravindG
    • 4 years ago
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    ya u r spam

  49. AravindG
    • 4 years ago
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    can u show a fig

  50. AravindG
    • 4 years ago
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    eashmore?

  51. anonymous
    • 4 years ago
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    |dw:1328338036916:dw|

  52. AravindG
    • 4 years ago
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    hw can wind return to fan??

  53. anonymous
    • 4 years ago
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    Those are forces. The square below represents the boat system. There are not external forces. |dw:1328338113551:dw|

  54. AravindG
    • 4 years ago
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    srry easmore bt i am not getting u

  55. AravindG
    • 4 years ago
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    :(

  56. AravindG
    • 4 years ago
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    i dont understand hww a return force acts on fan

  57. anonymous
    • 4 years ago
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    Do you doubt the existence of the return force or what causes the return force?

  58. anonymous
    • 4 years ago
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    Instead of a fan. Let's say you push directly on the sail mast. In this case, would the boat move?

  59. anonymous
    • 4 years ago
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    I have to leave soon.

  60. AravindG
    • 4 years ago
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    hey gogind can we cntinu with this discussion?

  61. AravindG
    • 4 years ago
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    k pls xplain

  62. anonymous
    • 4 years ago
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    hmm..lets see...You are having trouble with imagining the force that is acting on the fan, correct?

  63. AravindG
    • 4 years ago
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    ys

  64. anonymous
    • 4 years ago
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    Try imagine in like this. Fan pushes a bunch of molecules to the sail of the boat (we call that wind) , but since all these little molecules have some mass, newtons 3rd laws says that: As the blade of the fan exerts force on the molecules, all those molecules must exert the same force on the blade but it in opposite direction. OK! So now there is a bunch of molecules traveling towards the sail and eventually hitting it. When they hit the sail the same thing happens, they exert force on the sail, and since the sail is connected to the boat, they actually exert in on the boat. So in conclusion: The boat wants to go backwards, because of the force molecules exert on the blade of the fan which is connected to the boat, but the same molecules hit the sail which is also connected to the boat, causing the boat wanting to go forward. So the net result of this two forces is 0, because they have the same magnitude but opposite direction. What do you think would happen if there was no sail?

  65. AravindG
    • 4 years ago
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    hmmm..it would have remained in rest

  66. AravindG
    • 4 years ago
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    isnt it?

  67. anonymous
    • 4 years ago
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    if there IS a sail it would remain at rest, because the forces cancel each other. If there were NO sail at all, the boat would travel backwards. In the boat with no sail, molecules that acted on the blade of the fan would just travel in the opposite direction of the boat with nothing to stop them (no sail), so the only force that is acting on the boat is the one acting on the fan, since there is not force to cancel in out the boat would move backwards.

  68. AravindG
    • 4 years ago
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    k i understood

  69. AravindG
    • 4 years ago
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    but is it sure that alll molecules from fan would hit the sail??

  70. anonymous
    • 4 years ago
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    of course not. What we are talking about here is the ideal situation. In real life a good part of molecules would not hit sail. Imagine you had a really small sail and a huge fan, some molecules would hit the sail but a bigger part of them would not. So the net effect would be that you are moving backwards. In this case the force acting on the blades is much garter then the one acting on the sail...

  71. AravindG
    • 4 years ago
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    k i understood it cmpletely thx

  72. AravindG
    • 4 years ago
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    i hav some othr doubts too can u help?

  73. anonymous
    • 4 years ago
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    I don't have time, since I'm studying right now. Just post the question in the group and someone will answer, if they don't I'll answer later if I can

  74. AravindG
    • 4 years ago
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    wen will u be free?

  75. anonymous
    • 4 years ago
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    I don't know, when I get tired i guess :D. Just post on the group I'm sure someone will take a look at it

  76. anonymous
    • 4 years ago
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    what doubts??

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