Recent content by lanvins

seriously there's sumthing wrong with u New South Wales kids. Ur missing a few brain cells i think!!!!

The populations of Cook Islands and Niue in the South Pacific has been decreasing at an average rate of 2½% per year over the last 5 years. If the combined population was 23400 in 2007 Define all terms clearly. a) General formula for Half-Life, knowing the rate of change: For the given rate of...

Does anyone know how to draw a sketch of the circuit, showing the generator (source), homestead (represented by a resistance), current by symbol I, and the 200 V voltage as VH.

A particular car travels 20000km in a year and operates at a 20% effiency in transforming the chemical energy in fuel into mechanical energy(motion). The car has a fuel consumption of 10L per 100km and its petrol tank holds 50L a. The amount of energy supplied by a full tank of petrol b. the...

A temperature rise of 1.78oC was observed when 1.00*10^-3 mol of propane gas was burnt in a calorimeter. The calibration factor of the calorimeter was previouly determined to be 1250J oC^-1 1. calculate the heat of combustion of propane in kJ mol-1

1. Find the coordinates of P, the point of intersection of the curves y=e^x and y=2+3e^(-x). If these curves cut the y-axis at points A and B respectively, calculate the area bounded by AB and the arcs AP and BP. Give you answer correct 3 decimal places. 2. differentiate f(x)= loge(x) /...

For Q1, the book has it as -3loge |2x-5|+c, where the 2x is positve and the 5 is negative. why is that? Q2. i don't get the point of this step y' = 6u^-2.du.(dx/du) dx/du = -1/2 Q3. same problem as question 1, the book has it as y = -1/3 log|-4+3x| +C Q4. the back of the said the answer...

thanks

integrate 1. 6/(5-2x) dx 2. 6(1-2x)^-2 dx 3. (4-3x)^-1 dx 4. find y in terms of x for each of the following dy/dx= 1/(2x) and y=2 when x=e^2 Thanks

1. The OCl- ion acts as a base in water according to the equation OCl-(aq) + H2O(l) HOCl(aq) + OH-(aq) When two drops of 5.0 M NaOH are added to an equilibrium mixture of OCl in water at constant temperature what is the effect on equilibrium? 2. Benzoic acid, C6H5COOH, molar mass 122 g mol-1...

1. For pi/2< a < pi with sin a=cos b where 0<b<(pi/2), find a in terms of b 2. For pi/2< a < pi with cos a = -sinb where 0<b<(pi/2), find a in terms of b thanks

More questions, 1.a If a log2 7= 3- log6 14, find the value of a, correct to three significant figures b. If log3 18= log11 k, find the value of k, correct to one decemial place 2. Solve- 3^(2x) - 3^(x+2)+8=0 Thanks

Hey, these are questions i had trouble with Solve the following for x, b. log e (5x) - log e (3-2x) +1 c. Log e (x) + log e (3x+1)=1 d. (8e^-x) - e^x =2 Simplify, a. 1+ log10 a - (1/3)log10 b b. log2 x -2log2 y + log2(xy^2) Evaluate, a. log2 square root 2 + log2 1 +2log2 2 Thanks

<H1 class=subject>Systematic name for CH3(CH2)7CH2Cl? how do you find the systematic name for CH3(CH2)7CH2Cl. How do you decide if its an alkane or alkene? </H1>

i'm still a little confused about Q3 why did you balance it with 02- and how did u know to do this (where did it suggest in the question) ? Also, how did u do Q3 b, like where did Al2O3 come from? when balancing half equations, in what instances do you use oxygen to balance the equation...