IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: ketone on May 20, 2010, 04:57:07 pm
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An oil viscosity question and electricity question i expect with a diode.......
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I m not cheating. discussion is not allowed until 24Hours after paper. i M talking abt it before paper........
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i dont know what variant is this
but im sure for variant 1
Pendulum question and a HUGE electricity question. looks like we need time organization.
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p33 is abt oil and stopwatch.
p34 is abt oscillation so stopwatch is involved and there one mechanical with magnet and threads.
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p33 is abt oil and stopwatch.
p34 is abt oscillation so stopwatch is involved and there one mechanical with magnet and threads.
do u know any gd websites with videos which show any information abotu diodes ? ???
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do u know any gd websites with videos which show any information abotu diodes ? ???
http://www.mayothi.com/diodes.html
http://www.kpsec.freeuk.com/components/diode.htm
http://freecircuitdiagram.com/2010/05/16/how-to-test-a-diode-video-tutorial/
i hope you find them useful :)
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http://www.mayothi.com/diodes.html
http://www.kpsec.freeuk.com/components/diode.htm
http://freecircuitdiagram.com/2010/05/16/how-to-test-a-diode-video-tutorial/
i hope you find them useful :)
THEIR PERFECT
thx ;D
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haha your welcome :D
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hi...
how would you do the "oil viscosity" question???
any example???
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p33 is abt oil and stopwatch.
p34 is abt oscillation so stopwatch is involved and there one mechanical with magnet and threads.
are u sure the magnet doesnt have anything to do with the oil viscosity experiment...???
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NO, according to my reports there are no magnets involved in p33. only an oil viscosity and a BIG electricity question............
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NO, according to my reports there are no magnets involved in p33. only an oil viscosity and a BIG electricity question............
how can there be no magnet involved? how will we take the beads out? please can you post the complete list of confirmed apparatus?
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magnet is in Phy p34.
I've googled for many sample experiments for this "oil viscocity". And visited a lot of pages to see how the experiment can be done, what are the possible errors, and improvement methods..
These are some of the good answers that I found.
Oil Viscosity
Error
1. small air bubbles are formed on the marble/spheres/(any balls being used) which hindered the motion of the ball
2. two sets of reading not enough to draw a valid conclusion
3. human error in timing
4. marble may have not reached terminal velocity
Method of improvements
1. release the ball/marble just a few mm above the oil surface
2. take more readings and plot a graph
3. use light gate to trigger stopwatch/high speed camera with known time intervals/use video camera with slow motion replay
4. ensure the terminal velocity by increasing the release height/using long tube/measure velocity at two intervals to check terminal velocity reached.
I took three of the errors and method of improvement from october/november 2007 paper 32 question 2 marking scheme.
It is also about terminal velocity.
There are other general improvements that I've found in net...But, I dunno how to state a possible error for them.
1. marble released gently into the top of the solution and that it doesn't touch the side of the tube. Using a wider tube
2. Allow oil to stand for a while to let it settle removing all air bubbles.
but keep ur mind cool and calm in the paper to get new improvments in ur head at the right place and at the right time...............................
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ok thanx and pleaseeeeeeeeeee post the list of apparatus!
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Hey what about Chem n bio practicals??? of S4 group... plz i need i help...
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any idea related to the electricity question??
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Hey what about Chem n bio practicals??? of S4 group... plz i need i help...
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I mean 34 practicals!
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Can someone help me please?
Here's the link to my topic ... link (https://studentforums.biz/index.php/topic,8212.0.html) it's urgent! thanks!!
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hey is anyone done with p33 ??
i did it and i found that it was pathetic one experiment was riliiiiiiiiiiiii gd . the other i got stuck attaching the circuit for one hour until the teacher did it :)
so basically i got screwed 8)
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it is quote in the
http://www.cambridgestudents.org.uk/subjectpages/physics/asalphysics/ASA_Level_Physics.pdf
"If you find yourself in real difficulty setting up your practical equipment you may ask
your supervisor for help, although you may lose one or more marks for this."
the heck is rong with our teachers? either they haven't read the confidential papers properly or they dont a sh*t bout how cie prac work?
none of them help us!
question 1 was sh*t. i got rong apparatus and then wont get values and i cant ask for help cuz invigilators are just ignorant!
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it is quote in the
http://www.cambridgestudents.org.uk/subjectpages/physics/asalphysics/ASA_Level_Physics.pdf
"If you find yourself in real difficulty setting up your practical equipment you may ask
your supervisor for help, although you may lose one or more marks for this."
the heck is rong with our teachers? either they haven't read the confidential papers properly or they dont a sh*t bout how cie prac work?
none of them help us!
question 1 was sh*t. i got rong apparatus and then wont get values and i cant ask for help cuz invigilators are just ignorant!
T.H.A.N.K.U!!!!!!!!!!!!!!!!!!!!!!!
they dont get anything :SSSS their useless :'( i just regret the day i ever took physics not a single paper was pleasing ....SO FAR *sarcastic*