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Physics CIE help

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*Hope*:

--- Quote from: ima_shah2002 on April 18, 2010, 11:41:01 am ---hey i have doubt in this question its wo4 20 have uploaded

--- End quote ---
in order for equillibrium to be reached, the pressure at both sides must be equal
so pressure at P= pressure atQ
since pressure= density*gravity*height
and density=mass/volume
pressure P= density*gravity*2h
pressure Q= density*gravity*h
so density of p must be half to get same pressure of Q

cashem'up:
hey m still confused...................

*Hope*:

--- Quote from: ima_shah2002 on April 18, 2010, 12:11:45 pm ---hey m still confused...................



--- End quote ---
Ok no prob we will take it step by step:
1) what does equillibrium mean?
it means that they are not moving right?
This means there is equal forces on each side acting downwards
2)since pressure= force/area so equal pressure because equal forces acting on equal areas (vessel) and pressure is equal to  density*gravity*height
3) however height of P is doubled than of Q so new pressure will be doubled of Q but
we must get EQUAL pressures and also gravity is not changed so density must be halved at P to get same pressure
so now we have half density of P since double height
Note:try with values if u still don't get it and see what happens to density

cashem'up:
thanks got it>..........

halosh92:
paper 2 june 2004 cie physics AS
Q 6cii

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