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hey physicsss helpppp !!!!

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Naruto123:
what is linear expansion 
hw to find circumference of a pencil using a thread
does widening the barometer change the pressure of liquid


Lastly in ppr 6 dey always have this triangle and tell to draw hw it will appear on the screen how do we knw wat size or if inverted or upright ???

answer dem asap thx

MaNi_DaDuDe:

--- Quote from: 123456789 on March 24, 2010, 09:28:39 am ---what is linear expansion  
hw to find circumference of a pencil using a thread
does widening the barometer change the pressure of liquid


Lastly in ppr 6 dey always have this triangle and tell to draw hw it will appear on the screen how do we knw wat size or if inverted or upright ???

answer dem asap thx

--- End quote ---

Linear Expansion - (The increase of a planar dimension, measured by the linear elongation of a sample in the form of a beam which is exposed to two given temperatures)
When length of a solid (rod) is much greater than its breadth and thickness, linear expansion or expansion in length is considered.


Length of a rod


Length of a rod increases on heating

--

About barometer.. I think since pressure is force per unit area, it doesn't matter how wide the tube is, as long as its diameter is constant.

pz


-MaNi

astarmathsandphysics:
WWind the thread 20 times anround the pencil, then measure the length of thread wound and divide it by 20

Naruto123:
thx a lot guyz bt wat abt da ppr 6  question ?
the triangle ???

astarmathsandphysics:
Can you say the paper? year/board etc

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