Diyadiya
  • Diyadiya
whats the angle b/w instantaneous displacement and acceleration during the related motion?
Physics
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SOLVED
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schrodinger
  • schrodinger
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apoorvk
  • apoorvk
okay i am a bit confused, that since we are talking about relative motion, is the acceleration and displacement relative as well? never mind. see. since the angle is being asked, you can well guess that this is something to do with vectors. now just get the displacement's equation in vector form (if it snot given in that form, you can always assume a coordinate system and then take appropriate directions) at the required instant. now again, find the acceleration's equation for the instant. now you have to vectors. can you remember how to find the angle between two vectors? *HINT* dot product!!! so if acc= (vector a) and displacment= (vector s) then, (vector a).(vector s) = |vector a|*|vector b|*cos(theta) where theta is the angle between the two vectors. remember how you can find the magnitude term of any vector in i^ and j^ form? (don't panic if the acceleration and velocity terms aren't in the absolute constant terms, and rather in terms of 'time' or 'displacement, just do the maths there, and do not worry if you didnt understand a bit of what i explained) again, posting a real problem would really help to illustrate. :)
apoorvk
  • apoorvk
lol, i meant *two vectors and sorry for the other million typos!
apoorvk
  • apoorvk
and in the second part of the equation of dot product, i meant |vector a| * |vector "s"| and not "b" instead of "s"

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Diyadiya
  • Diyadiya
actually this is the exact question and choices are A.0 B.pi/4 C.pi/2 D.pi
apoorvk
  • apoorvk
just a second. did you mean "rotated" or "circular" motion above? or does 'related' itself mean circular??? i feel like an alien again -\(o.O)/-
Diyadiya
  • Diyadiya
"related" thats what given in the book answer is Pi thers a hint: retardation is directly opposite to direction of motion
apoorvk
  • apoorvk
then has to be 'pi'.
apoorvk
  • apoorvk
|dw:1333309902444:dw|
Diyadiya
  • Diyadiya
lol yeah :D
apoorvk
  • apoorvk
lol, why did i not understand the question?? o.O
Diyadiya
  • Diyadiya
btw why is it retardation?
Diyadiya
  • Diyadiya
isn't it acceleration?
apoorvk
  • apoorvk
retardation means negative acceleration. any acceleration that has the effect of reducing the velocity. so here. as you move relatively, you get retarded in the direction opposite to which you are moving at during that instant. still i 'd call the question pretty ambiguous since the relative motion can multi-faceted and spread over two-directions. they ought to have mentioned more. that's what i think. lets consult @ishaan94 . what book are you solving btw?
apoorvk
  • apoorvk
lol.. am i drunk or whta? i meant "two dimension" and not directions.
Diyadiya
  • Diyadiya
Well ,1min
anonymous
  • anonymous
Yes, the question is ambiguous... |dw:1333316589443:dw|And what the hell is related motion?
Mani_Jha
  • Mani_Jha
Is there any diagram given? Or it must be a part of a bigger question. Analyzing the grammar, that the word 'the' is given, it definitely refers to some other diagram or example(lol).
anonymous
  • anonymous
@diyadiya,post the diagram of your question,your question is not complete.if there is no digram and if you ask this question anyone then he will say 0 or pi it depends on either it is acceleration or retardation respectively.If your question relates to simple_harmonic motion then angle between acceleration and displacement will be pi.in your question ,hint is given retardation..
apoorvk
  • apoorvk
nice observation @mani_jha

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