Help with Mano and barometer physics ASAP

[tribianni]

Ppl im blank in igcse physics the Mano meter nd barometer plaza explain ASAP

 

[IGCSE O/L student]

manometer is a u-shaped tube wid mercury(or ny other liquid) inside. if u insert one end inside a tank of a higher pressure dan atmospheric pressure, da level of da mercury on the other end will rise. da pressure inside da tamk is equal to 76cm of mercury plus da height difference of mercury. barometer is an upside dwn tube in side a beaker of mercury(or ny other liquid). the atmospheric pressure is equal to da height of mercury.

 

[tribianni]

i got the mano meter concept ........
fr the baro meter wt abt the left out air gap on the top of the tube??
nd thnxx aloooot

 

[IGCSE O/L student]

i got the mano meter concept ........
fr the baro meter wt abt the left out air gap on the top of the tube??
nd thnxx aloooot

da gap is a vacuum. dere is no air, coz if dere is air, da pressure caused by da air molecules will reduce da level of mercury.
ur welcum! nytym! jst pray 4 me n my xams.

 

[tribianni]

aaaah ohkaaay.........
thnx again.....
ofcourse ill pray.......
well in return u tooo pray fr me.......

 

[IGCSE O/L student]

aaaah ohkaaay.........
thnx again.....
ofcourse ill pray.......
well in return u tooo pray fr me.......

Insha Allah, of course i'll pray 4 u, bro!

 

[tribianni]

thnx sista

 

[IGCSE O/L student]

thnx sista

ur welcum!

 

[tribianni]

heyy i need help 1ce more
question numbr 12 ,18 nd 28...........can u xplain dem plzzz http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w11_qp_12.pdf

 

[IGCSE O/L student]

heyy i need help 1ce more
question numbr 12 ,18 nd 28...........can u xplain dem plzzz http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w11_qp_12.pdf

question 12: the difference between the two levels is 20cm, so da pressure is 20cm of water more dan da atmospheric pressure.
question 18: the oil has a lower tendency to store heat than water, so the temp of da oil rises faster dan water.
question 28: wen u move da contact towards X, da resistance across L2 increases, so da voltage across it increases, makin it brighter. meanwhile, da resistance across L1 decreases, so da voltage across it decreases, makin it dimmer.
hope u understand!

 

[tribianni]

aaah okieee dokiee..... got it
heey arryt tmrw is the xam.......wt wud u suggest ......to study today fr the prepration?

 

[IGCSE O/L student]

aaah okieee dokiee..... got it
heey arryt tmrw is the xam.......wt wud u suggest ......to study today fr the prepration?

glad to hv helped. if u'v gone thru ur notes, n books, as a brush up, jst practise da most recent past pa-pers as mch as possible.

 

[tribianni]

well notes done.........book now reading.......
well which chaptrs shud i study more??
nd like pastpprs frm 2008 above??

 

[IGCSE O/L student]

study da chapters da hv a higher tendency 2 run out of ur mind, lyk "Electricity and Magnetism"
yes, dat will help u

 

[tribianni]

arrytii......
do u have sme notes for physics?

 

[IGCSE O/L student]

not soft copy. it is always da hard copy. sry abt dat!

 

[tribianni]

aah arryt no prob.........aneways thnxx

 

[IGCSE O/L student]

ur welcum, if u need nythin jst ask me.

 

[tribianni]

SuUre

 

[tribianni]

sorry to disturb agn nd agn
the questions like.......400 mg radioactive material......has 5 days half life............wt will it be aftr 10 days........i dont gt dis! how to solve dese....its ppr 1 question physics