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Physics CIE help

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Amr Fouad:

--- Quote from: halosh92 on April 14, 2010, 06:17:42 pm ---thx alot...but wats the "?" in ure explanation?

--- End quote ---

oh lol sorry SF cant comprehend that lol

i meant Londa..the wavelength symbol..substitute ? with Londa

*Hope*:

--- Quote from: nid404 on April 08, 2010, 10:45:35 am ---11) sum of momentum before collision=sum of momentum after collision

ball A
mVA- mUA
ball B
mVB-(-mUB)(opp  direction )

p of ball A=ball B (for elastic collision)

mVA- mUA=mVB-(-mUB)
VA-UA=VB+UB
VA-VB=UB+UA

--- End quote ---
why did u take the momentum of A alone and B alone, shouldn't we take A and B before collision and A and B after considering the signs so like mUa-mUb=mVa+mVb??
plz explain nid

Saladin:

--- Quote from: notty_me on April 14, 2010, 05:51:18 pm ---hey ppl,
when a graph line is sloping downwards, it has a neg. gradient so if we had to cal. the value of the gradient will it be written as  " -x" or " x"???????

--- End quote ---

cashem'up:
hey i have doubt in this question its wo4 20 have uploaded

astarmathsandphysics:
-x

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