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Discussion for physics P-21 CIE here!

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leebux101:
first equation... m1/m2 = v2/v1
second equation... e = 0.5mv^2 + 0.5mv^2

i did trolley b for the lesser KE..

for the diffraction grating... i did tht they will form in a horizontal plane..


i am not sure abt any of these answers though..lets see what pthers think...

mr.incredible:

--- Quote from: Bakhtawar on June 10, 2010, 03:52:07 pm ---first equation... m1/m2 = v2/v1
second equation... e = 0.5mv^2 + 0.5mv^2

i did trolley b for the lesser KE..

for the diffraction grating... i did tht they will form in a horizontal plane..


i am not sure abt any of these answers though..lets see what pthers think...

--- End quote ---

First equation m1v1=m2v2  (conservation of momentum), your equation is correct although i don't know how did you get it in such way !

Second equation, same like you.

I chose the trolley with the least mass for greater kinetic energy as it will have greater speed and Ke= 0.5 m"v^2"

leebux101:
yeah that was trolley b. it had lesser mass

abt the firsy equation...i wrote wut u wrote and then put it as a ratio...
r u sure abt the second equation though?

leebux101:
does anyone have other ideas?

sweetie:
for the grating Que. i wrote that the positions of X,Yor P wont change!!!

nd about the power Q. will it decrease or increase?
i wrote it will decrease.....

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