Recent content by Scharles

What is the polyhedron described by the equation {x} + {y} + {z} = 1 ? Justify carefully your answer, and then determine the lateral surface area of this polyhedron. {x} is modulus of x.. can i know how to do this question ? i can't even understand the question..

i have no idea on how to solving this... please kindly teach me how to start on solving this sort of question...

Given that the Van Der Waals equation is (p + (an^2)/v^2)(v-nb)=nRT where n,a,R and b are constants... How to we find the derivative of p wrt v ? How to find the derivative of p wrt T without further differentiation ?? Can anyone teach me how to do this question ? Sincerly thanks~

Given : plane 1 : z=x+y plane 2 : 2x-5y-2z=1 Find the equation of intersection of plane 1 and plane 2. i have no idea how to solve 3 unknowns in 2 quations, please help~ thanks~

http://img264.imageshack.us/img264/933/61026765.png Uploaded with ImageShack.us does my forces diagram draw wrongly ?? anyway, thanks for answering me~ now i know that R = mg cos theta~~

i am quite confusing about those reaction force... let say a body is placed on inclined plane with angle @... at equilibrium, what are the forces that balances each other ?? mg cos@ balanced by R or R cos@ balance mg ?? thanks~

for (c), i have no idea, but i had tried it using binomial distribution... Let Z = Zaki wins the game Z~ B ( 5, 0.25) P(Z>2) = P(Z=3) + P(Z=4) + P(Z=5) = 5C3(0.25*3)(0.75*2) + 5C4(0.25*4)(0.75) + (0.25*5) = 0.1035 which is not same to the answe given~ am i using a...

for (b), i do like this ... P(x) = P(R) + P(R'Z'R) + P(R'Z'R'Z'R) + ... = 1/4 + (3/4)(3/4)(1/4) + (3/4)(3/4)(3/4)(3/4)(1/4) + ... = (1/4) ( 1 + [9/16] + [9/16]*2 + ...) = (1/4) (1/[1-9/16]) sum of infinity.. = (1/4)(16/7) = 4/7 the answer i...

for (a), i used 2 method to solve this question, first method get the answer but second method the answer i get was different ~ can u tell me which part of my solution was wrong ? method 1 : let R = ramli win and Z = zaki win P(Zaki loses on his first toss) = P(R'Z'R) + P(R'Z'R'Z) +...

Zaki and Ramli play a game in which they take it in turns to toss a tetrahedral dice. They agree that the first man to toss a "2" wins the game. Ramli toesses the dice first. (a) Find the probability that Zaki loses on his first toss. (Ans : 3/16) (b) If x is the probability that Ramli...

This question involves a table... The weight of 150 fish in a pond are shown in the table below. Weight of fish (in gm) Number of fish,f 10-19 6 20-24 12 25-29 30...

http://img19.imageshack.us/img19/2692/chptitration.jpg http://img130.imageshack.us/img130/6351/titrationfigure1.jpg 1.)For the titration of strong acid and strong base, and at the beginning of the curve, how to explain the big amount of base added only increase a little of the pH value...

isn't mean that the ratio of [products] / [reactants] remain unchanged after the system is adjusted to equilibrium ??

why the equilibrium constant only depending on temperature but not concentration and partial pressure ? Since K= [product]/[reactants], why the value of K remain the same as [product]or [reactant] increase ?