Qualification > Sciences
How did u guyz do in phys p1 ?
cashem'up:
--- Quote from: highly_ambitious on May 20, 2010, 03:24:11 pm ---hey guys, what did ya'll right for the question which asked abt efficiency. I wrote D..plz explain if it's correct. n was the answer for first question 1.95mm?
ans for a was 1.45mm
--- End quote ---
cashem'up:
--- Quote from: Spy on May 20, 2010, 03:35:13 pm ---answer of uncertainity 0.6 FOR SUREEEEEE
effeciency was C look back in the topic i explained.
and for the power its 5.5kw, and im pretty sure :)
--- End quote ---
no man the efficiency is D m pretty sure :)
yes as u said energy input is Fs
and energy output is not ke because if i am not wrong speed was constant so u have to use pe...thus mgh/fs however we dont know h
so mgsina x s / fs so mgsina/f
cashem'up:
--- Quote from: MAF on May 20, 2010, 03:43:13 pm ---efficiency was mgsina/f. i think that was the option D. and about that i'm sure :)
and spy could you do the uncertainty question here?
--- End quote ---
hey tht question i can solve can u jst recall the values for uncertainty
highly_ambitious:
--- Quote from: Spy on May 20, 2010, 03:35:13 pm ---answer of uncertainity 0.6 FOR SUREEEEEE
effeciency was C look back in the topic i explained.
and for the power its 5.5kw, and im pretty sure :)
--- End quote ---
uncertainity answer was 0.5 for sureeeeeeeeeeeeee
efficiency was d...for sureeeeeeee
n yeah ! for power 5.5kw Thanks!
does any one remember answer for rubber band wala question...there were graphs of force to extension and rubber was stretched till it's breaking point? was was the ans...i wrote A is it's correct? plz explain..
[Spy]:
no im sure its C because effeciency=work/energy input
and we all know work=ke=0.5mv^2 and energy input is worke done by driving force which is equal to Fs
0.5mv^2/Fs = mv^2/2Fs
it had nothing to do with mgsin because its energy and mass not weight
and even if it was constant so? just keep it 0.5mv^2 you still have a velocity
though you have a point ima_shah2002 :P
yes i can if someone can remind me of the values :)
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