Qualification > Sciences

How did u guyz do in phys p1 ?

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mr.incredible:

--- Quote from: sabrina on May 20, 2010, 12:40:46 pm ---i m sorry but really whatever i m saying i cross checked my sir.
for the wave i think it was ultravoilent ( do u remember the frequency or the wavelenght which was given if yes then i can give the exact answer right now)
for the car going up was D

--- End quote ---

I chose ultraviolet too. I think the gap width was 10^-5 m.

For the car going up, I chose C which was 0.5mv^2/2Fs.

Do you remember the answer to that crane lifting things up  :D ? I chose 5.5 KW

mr.incredible:
By the way, Sabrina, what is your sir's expectations for the grade thresholds ??

sabrina:

--- Quote from: mr.incredible on May 20, 2010, 12:47:57 pm ---I chose ultraviolet too. I think the gap width was 10^-5 m.

For the car going up, I chose C which was 0.5mv^2/2Fs.

Do you remember the answer to that crane lifting things up  :D ? I chose 5.5 KW

--- End quote ---
same here 5.5kw is the ans

[Spy]:
guys the effeciency IM 100% sure its C mv^2/2FS dont tell me sir or whatever its simplee!!

effeciency=work/energy input
work = kinetic energy change = 0.5mv^2
and energy input is always equal to the work done by driving force= Fs
there fore 1/2 * mv^s/Fs=  mv^2/2fs

sabrina:

--- Quote from: mr.incredible on May 20, 2010, 12:49:56 pm ---By the way, Sabrina, what is your sir's expectations for the grade thresholds ??

--- End quote ---
sir says that the thresshold can be around 29 or 30 or 31. he himself said the question were very tricky

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