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Physics, Chemistry and Biology: Post your doubts here!

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I'm doing chemistry p3 .. and why are the markschemes so sensitive ? like there is this question that why is aluminium used in cables .. so it can also be bcz aluminium has a high melting point right ? but the markscheme dosent say that :eek:_O Why's that ??
 
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I'm doing chemistry p3 .. and why are the markschemes so sensitive ? like there is this question that why is aluminium used in cables .. so it can also be bcz aluminium has a high melting point right ? but the markscheme dosent say that :eek:_O Why's that ??

I guess thats not the main reason.. because the temperature outside never gets high enough to melt any metal lol.
Main reason is because it's light weight and prevents sagging of cables.
 
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I guess thats not the main reason.. because the temperature outside never gets high enough to melt any metal lol.
Main reason is because it's light weight and prevents sagging of cables.
Hmmm yeah point :oops: but the other questions, y so sensitive markings :cry: i hate chem :notworthy:
 
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http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_3.pdf
q- 1 c
8 c and d
10 a
and 11 how ??? :(
please some one solve these for me :)

Question 1 (c) u have to simply find the area under the graph, that is 1/2*b*h , so 0.5*5*10.5 = 26.25
Question 8 (c) Decreases because resistance increases causing the current to decrese =)
Question 8 (d) 4 ohms, because the resistance will double ..
Alpha goes into paper because it gets absorbed , charge, alpha carries a +2 charge,
Beta goes out of paper because it can pass through paper (in tiny ammount) charge always -1 (electrons)
Gamma nothng happns, and no charge, never it carries charge,

Hope i helped =]
 
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I think its like u have to measure the vertical height of the pins sharp point with the bench , and then from just below the pinhead to the bench, if the heights r equal .. then its horizontal .. =]
ahan :) .... thnx!!
 
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