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    Toughest P1 Math questions I came across. A little help...?

    Re: Toughest P1 Math questions I came across. A little help. the trigonometry question is really not easy!!! there you go.. usually i'll prove it using both side, easier this way for complicated questions like this.
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    physics cie ques

    planet master, i'm sorry i still dont understand why do you have to add it up. what is the reason behind, could you pretty please explain? and for mcq 14, since the vertical velocity is zero, then according to 1/2mv^2, i thought the kinetic should be zero? how to relate them?? thank you.
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    practicals.............

    princesszahra, can you pm me too, pretty please? i need to know about bio, chemistry most importantly and physics, thank you a lot!!
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    Maths AS PAPER 1 HELP PLEASE

    cross multiply, it's easy. a=a 1st arith term = 1st geome term a+4d=ar 5th arith term = 1st geome term a+14d=ar^2 15th arith term = 3rd geome term a over (a+4d) is r, and is constant, look at the answer scheme again, i'm sure you know
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    chem mcqs........

    mj05 q13, A and D definitely out, it is too far from aluminium, we only have to consider B and C. to consider the electronegative, we need to look at the atomic radius, as atomic radius increase, the electronegative decrease. so, magnesium has a bigger radius than aluminium, so has lower...
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    chem mcqs........

    qs 13, across period, the size of atom decreases, because the outermost electron increases, so the attractive force between the nucleus and the electrons increases. Shielding effect is not necessary to be considered because acorss period the number of inner shell electrons remain the same, so...
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    practicals.............

    any other hints?? is there anions/cations that is difficult to determine? like sometimes nitrate nitrite and sulphate sulphite, and sometimes oxygen/hydrogen and carbon dioxide, cause we got only 1 chance sometimes, which should we try first?
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    physics cie ques

    planet master, for mcq qs 18, why do we need to add up the rise on the right, and drop on the left? please help. also would you mind in explaining p11/0N 09 MCQ 13 and 14? thank you in advance
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