Qualification > Sciences
IGCSE PHYSICS
moon:
Thanx a lot for both of u as u helped me to understand these questions... :) :)
cooldude:
--- Quote from: moon on November 07, 2009, 07:02:25 pm ---Thanx a lot for both of u as u helped me to understand these questions... :) :)
--- End quote ---
np, ur welcum feel free to ask some more qs
@d!_†oX!©:
--- Quote from: cooldude on November 07, 2009, 06:37:18 pm ---i didnt knw which varaint u were askin for, neway ur ans---
we knw that (p1*v1)=(p2*v2);
therefore 12000*75=300000*v2
therefore v2=30mm
the distance of the piston from the closed end was=75mm
the distance of the piston from the closed end now is=30mm
therefore the distance it has been moved=75-30-45mm
--- End quote ---
By the way cooldude...ur method is wrong cuz 75mm is not the volume but the length....u gotta show it in the volume format as i did in my post....
just look back cuz if u show this working in ur p3, u will lose some of ur marks there....
Ghost Of Highbury:
i suppose he cancelled out the area because they were common, and thus had only 75mm
@d!_†oX!©:
hmmm...maybe because dts wt we ought to do...bt m just telling him dt the cancelling of the area is necessary to show....
By the way aadi, do u know the formula for the focal length...???
i know for convex lens, just wanna know if it is the same for concave as well...
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