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Could someone help me with this question? When I form the integral I get: \sqrt{3}\int_{-2}^{2}\sqrt{1-\frac{x^2}{4}} \ dx But in the solutions they don't have a square root on the integrand, I'm not sure what I'm doing wrong :confused:. Thanks. The base of a particular solid is the...

Hey could someone show me how to do this question? After looking at the answers I think I understand how to do it now but I'm not sure about something they did. Thanks :). Equal volumes of lead II nitrate solution and sodium iodide solution, each with a concentration of 0.10mol/L are mixed. A...

Hey, so I've got exams coming up and I just wanted to ask a couple of questions about essays that include more than one text: 1. Is there a big difference between writing an AOS essay with one related text and the Module A comparative essay? Does the AOS essay involve 'less of a comparison'...

Could someone please explain if and how some elements dissolve in water? My guess is that it is the dispersion forces in the element molecules that are attracted to the polar ends of the water but if this is true it does go against the 'like dissolves like' generalisation. The syllabus dot...

Hey guys I'm having a bit of difficulty with this question: Write the expression cosy - (sqroot of 3) x siny in the form: r cos(y + a) Thanks

And why?

Hey could someone else please do this question and post their answer? I think the BOB might be wrong: What mass of sodium would be produced from the electrolysis of 1.00 tonne of molten sodium chloride if the electrolysis process was 92% efficient?

Hey guys So I am having trouble with part ii of this question. I can do everything including proving that AY = CX but I can't prove that BZ = AY =CX. I'd appreciate some help. Thanks.

Role call for anyone doing 2015 Italian Continuers (2014 can post too).

So I was sitting down at my desk about to write some notes on Economics for prelim half-yearlies and looking through the syllabus I realised that I have no idea how to write notes (or really even study effectively) for Economics. Some questions I have are: - Do I just write notes on the...

Hey guys, So I just want to know why the voltage drop across a resistor is equal to the voltage supply itself (or why is the sum of the voltage drops of the resistors equal to the voltage supply itself)? I understand what it means, I just don't understand why. (And please don't use some...

Hey. So I am stuck on this question because the answers say the first step is that OC bisects AB because they are perpendicular but how do you know that they are perpendicular, as it isn't given? Thanks