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wadha said:
DID I WRITE IN FLIPPIN CHINESE!!!
CHK ABOVE.
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chemistry and physics 31,33,34
- Thread starter moeedghaffar
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DID I WRITE IN FLIPPIN CHINESE!!!
CHK ABOVE.
about the diode prob in p33 v did one wid our teacher last year and on da LED or LDR(4got which 1)there were 2 thin wire terminals 1 was a bit longer than da other but i 4got which 1 was da +ive terminal da big 1 or da small 1.plz let me know as soon as possible cuz theres only 1 day left n i really wanna ace my exam this year
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yup magnet question..
oct nov 03 paper 3
oct nov 03 paper 3
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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
Another source..
http://www.iop.org/activity/education/P ... e_3683.doc
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
Another source..
http://www.iop.org/activity/education/P ... e_3683.doc