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ALL PHYSICS DOUBTS - POST HERE !!

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Baladya:
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss :)

Baladya:

--- Quote from: blackberry on May 26, 2010, 09:52:42 pm ---PLZZZZZ HELP!!!!!!!!!!!!!!

how can we reduce power loss in relation to resistance?? decrease or increase?
and wat r de methods for changing resistance in relation to length,thickness,area,temp etc of wire?

--- End quote ---

Decrease

And what do u mean?? just get a thinner and thicker wire (if thats ur question). But there is no method in doing that 0.o

red_911:

--- Quote from: Shazizzzle on May 26, 2010, 09:36:45 pm ---Okay, a few more things.

When experimenting latent heat of fusion, the mass taken into consideration is the mass of the MELTED ICE i.e THE WATER FORMED, right?

And, when experimenting latent heat of vaporisation, the mass taken into consideration is the MASS OF THE STEAM FORMED, in other words, (final mass of beaker + water after experiment) - (initial mass of beaker + water before experiment), right? ???

--- End quote ---
yeah u r right

blackberry:

--- Quote from: Baladya on May 26, 2010, 09:55:56 pm ---Decrease

And what do u mean?? just get a thinner and thicker wire (if thats ur question). But there is no method in doing that 0.o

--- End quote ---

like increasing the length of the wire increases resistance so what does increasin thickness of wire do?

diva_sparkles:

--- Quote from: blackberry on May 26, 2010, 10:00:10 pm ---like increasing the length of the wire increases resistance so what does increasin thickness of wire do?

--- End quote ---

decreases resistance n 4 temp it depends on da material eg semiconductors n metals

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