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IGCSE PHYSICS DOUBTS HERE !!!!

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elemis:
2008 Winter

Question 2

Its accelerating at all points.

Question 38

Half-life = time when radiation count rate is half initial value.

Half life = time when count rate is 70. That's in between 40 and 60 seconds.

2009 Summer

Question 11

You should recognise that the setup shown is used to measure atmospheric pressure in terms of mm of mercury. If the atmospheric pressure (the pressure on the pool of mercury in the dish) is same in both cases then the mercury must rise up to the same level no matter what the thickness of the tube.

This is because you MUST get a reading where the height of the mercury in the tube HAS to be 72 mm of mercury.

elemis:
2002 Summer

Copper = Conductor

Wood = insulator

Copper conducts the heat away quickly from the area around the paper straight to the far end. No burning of the paper.

Wood keeps the heat from being conducted away to the far end.... paper experiences significant burning on the wood side.

SauD~:
Summer 2003
17 i forgot the method, b'because i had done this long back, :-[

Summer 2007
21 is B because light rays bend(refract) when they move from 1 median to another,
As water is denser than air so the rays refract away from the normal ray.

30 is also B, as potentiometer requires 3 ways input so we eliminates A and D. About C its not correct as the current will flow through the wire because it has less resistant, and current always flow through the easiest path(less resistant) so B is correct.

Winter 2007
21 is B. It is because as B line is passing through center, if you cut the half of the above and fill it it the gap which the between of 2 trough, you will get the normal water line ( Sorry, i don't know how to explain, but this is my own theory and is Common sense ::))

Summer 2005
29 is D because as the voltmeter is always connected in parallel to the object whose voltage is to be measured.

32 is B. Its due to Variable resistor doesn't work in parallel.

Winter 2005
31 is A,
Current always flows through the easiest way, way which is of less resistance. So when S is closed, the current pass through the S part instead through resistor, so the brightness increases.

~ Miss Relina ~:

--- Quote from: ~ The Golden Girl ~ on March 23, 2011, 12:01:39 pm ---November 2002 Q10 ANS is D  , as the car is going upwards it gains height hence the G.P.E increases *E = mgh* , and they're telling you the car is accelerating meaning it's speed is increasing hence the K.E. increases :)

June 2004
Q11 ANS is A ,because Power=work done/time .. since they have the SAME time then we are going to look at the work done i.e the weight/energy ...and since the boys weighs more then his work done(=F*d) is more hence MORE power.

I gtg , I hope Saud helps you :)

--- End quote ---

Thanks alot but what is the relation By the way weight and energy is there is a rule or smthing ???

~ Miss Relina ~:

--- Quote from: Ari Ben Canaan on March 23, 2011, 01:30:26 pm ---2008 Winter

Question 2

Its accelerating at all points.

Question 38

Half-life = time when radiation count rate is half initial value.

Half life = time when count rate is 70. That's in between 40 and 60 seconds.

2009 Summer

Question 11

You should recognise that the setup shown is used to measure atmospheric pressure in terms of mm of mercury. If the atmospheric pressure (the pressure on the pool of mercury in the dish) is same in both cases then the mercury must rise up to the same level no matter what the thickness of the tube.

This is because you MUST get a reading where the height of the mercury in the tube HAS to be 72 mm of mercury.


--- End quote ---

for 2008 Winter
Question 38

Half-life = time when radiation count rate is half initial value.

Half life = time when count rate is 70. That's in between 40 and 60 seconds.

isn't 140 the background radiation ???
Thanks

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