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Physics

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--- Quote from: astarmathsandphysics on June 08, 2009, 12:19:05 pm ---Hot air rises away from the heater and draws in cool air through the gap


B

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ohhh yaaa haha i am so stupid i just hate these silly mistake, i just don't know why i thought for second that cold air is less denser haa i hate these moments :s


THANKS ASTAR :)

IGSTUDENT:
November 1999 paper 1 Question no.7 as per me the answer shld be "D" but as per ms it is "C" .can someone explain please?

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--- Quote from: IGSTUDENT on June 08, 2009, 12:53:56 pm ---November 1999 paper 1 Question no.7 as per me the answer shld be "D" but as per ms it is "C" .can someone explain please?



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because there is no friction so thiss means that no energy is lost, so when this happens automatically the ball will reach THE EXACT POSITION on the other side, which here is "C"


Hope that helps
Thanks

IGSTUDENT:
Does that mean the obstacle does not cause any loss of energy?

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--- Quote from: IGSTUDENT on June 08, 2009, 01:01:12 pm ---Does that mean the obstacle does not cause any loss of energy?

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by obstacle do u mean the curve downwards,, if u do then no it doesnt because there is no friction which is responsible for basically all energy wastage in the form of heat sound etc.


Hope this Helps

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