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ALL PHYSICS DOUBTS - POST HERE !!

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Girlie45:

--- Quote from: A@di on May 26, 2010, 09:58:05 am ---No Clue. CIE is evil.

--- End quote ---

LOL agreed.

Ivo:

--- Quote from: SoONa on May 26, 2010, 09:59:47 am ---1.The circuit of a motor racing track is 3 km in length. In a race, a car goes 25 times round the
circuit in 30 minutes.
What is the average speed of the car?
A 75 km / hour
B 90 km / hour
C 150 km / hour
D 750 km / hour


2. A sample of a solid is heated for 12 minutes and its temperature noted every minute.
The results are shown in the table.
time / min 0 1 2 3 4 5 6 7 8 9 10 11 12
temperature / °C 11.5 16.1 22.1 31.0 31.1 31.1 31.1 31.3 45.0 65.2 66.2 66.3 66.3
How should the sample be described at the end of the 12 minutes?
A all solid
B in the process of melting
C all liquid
D in the process of boiling




thanks in advance


--- End quote ---

Answer is 150 km/h, because 150/0.5 is that.

Dana:

--- Quote from: Ivo on May 26, 2010, 10:00:00 am ---By the way, just wanted to know whether solving past papers for 1993-2000 is worth it for P1, or should I do all of 2003 onwards first.

--- End quote ---
I think you should do older ones, there was a qs that came in chem yesterday from may 2000. Copy paste. I think CIE thinks we'll like forget abt the older ones so they get more questions from previous years :P also take a look at gce

Dana:

--- Quote from: Ivo on May 26, 2010, 09:58:22 am ---I'll say, Phy P1 will be harder than Chem P1, but then P3 would be easier than Bio! :D

--- End quote ---
Hahaha :P Bio was the WORST exam ever!  >:( I hated it! And I'm pretty worried abt chem and physics p3 :/

Ivo:

--- Quote from: SoONa on May 26, 2010, 09:59:47 am ---1.The circuit of a motor racing track is 3 km in length. In a race, a car goes 25 times round the
circuit in 30 minutes.
What is the average speed of the car?
A 75 km / hour
B 90 km / hour
C 150 km / hour
D 750 km / hour


2. A sample of a solid is heated for 12 minutes and its temperature noted every minute.
The results are shown in the table.
time / min 0 1 2 3 4 5 6 7 8 9 10 11 12
temperature / °C 11.5 16.1 22.1 31.0 31.1 31.1 31.1 31.3 45.0 65.2 66.2 66.3 66.3
How should the sample be described at the end of the 12 minutes?
A all solid
B in the process of melting
C all liquid
D in the process of boiling




thanks in advance


--- End quote ---

D, I reckon for the second one.  Cos of latent heat for 2nd time, no change in temp for boiling or melting.

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