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Hi. Why do streamers form in cathode ray tubes with the highest pressure? I have asked different teachers, but they all say different things. If the cathode ray tubes with the highest pressure have the most air particles in them, shouldn't there still be dark spaces because the electrons...

Hi. What is the difference is between Faraday's dark space and Crooke's dark space in cathode ray tubes? All my teachers use one or the other when talking about the dark spaces in the cathode rays tubes in the practical. It seems like they can be used interchangeably. However, when I asked...

Hi. This question was from my half-yearly exam for Physics: Which alternative correctly identifies the unites for magnetic flux and magnetic flux density? Magnetic Flux Magnetic Flux Density A. Tesla Tesla B. Tesla Tesla per metre...

Hi. I've been trying to install an application and this error comes up, "Can not change destination folder." After I press "Ok," the following error comes up, "Extracting file failed. It is most likely caused by low memory (low disk space for swapping file) or corrupted Cabinet file." I'm...

Hi. I'm looking to buy Advanced English book(s), but I don't know which one to get. I'll either get Excel HSC Advanced English or the four Top Notes books for the texts that I'm using in class. Which book(s) do you recommend is better to use as a study guide? Thank you.

Hi. I was looking on the Board of Studies website for some English past papers and I tried the 2012 one, however every single text says awaiting copyright. I checked the other years and most of them have texts which are still awaiting copyright. Is there any way I can get these past papers with...

Hi. P(x)=16x^4-32x^3+16x^2+kx-5, where k is an integer. P(x) has two rational roots, which are opposites of each other, and two non-real roots. a. If a (alpha) is a non-real root of p(x), show that Re(a)=1 and modulus(a)>1. b. If the rational roots are +- b (beta), deduce that b^2<5/16/ c...

Hi. The radius of the base of a cone is increasing at the rate of 2% per second. At what percentage is the height diminishing if the volume is kept constant? Can someone help me do this question please? Thank you.

Hi. Over the coming holidays, should I do the exercises from Cambridge Mathematics? Is it worth doing the questions? How long would it take to finish most of the exercises? I have both the Year 11 and Year 12 one. In class, we only used the horrible textbook by Johns and Couchman. Thank you.

Hi. Is the value for molar heat of combustion positive or negative? I've read different books and they're all different. Some don't put a negative sign for the molar heat of combustion, while some do. Which one is correct? Thank you.

Hi. What is the type of intermolecular force between alcohols? I had this in my chemistry practical test. I put hydrogen bonding, while the rest of my class put dispersion forces. Which is right? Thank you.

Hi. I received advice for my essays in Year 11 that mostly says that I should avoid storytelling, but I have no idea how to. Can you help me fix this statement to avoid storytelling: "The metaphor, ‘He walked back inside/ and slammed the door/ on my sporting childhood/ that disappeared into the...

Hi. My school uses Cambridge Mathematics 4 Unit by Denise Arnold and Graham Arnold along with Advanced Mathematics by Terry Lee. Is it worthwhile to buy more textbooks, such as New Senior Mathematics Four Unit Course for Year 12 by JB Fitzpatrick, Foundations of 4 Unit Mathematics by SK Patel...

Hi. I can't decide which book to buy out of the following: - Cambridge Checkpoints HSC by Neil Duncan (http://www.fivesenseseducation.com.au/products/cambridge-checkpoints-hsc-mathematics-extension-1-2012) - 100 Mini HSC's Extension 1 by John Smith...

Help Please. Show that modulus(modulusz1)-modulus(z2))<=modulus(z1+z2). State the condition for equality to hold. Thank you.

Help Please. a. Determine the roots of z^4+1=0 in cartesian form and plot them on an Argand diagram. b. Resolve z^4+1 into real quadractic factors. c. Divide by z^2 to show cos2x=2(cosx-cos45)(cosx-cos135). (x=theta) I have done parts a and b, but I have trouble with part b. Thank you.

Help Please. If p is real and p is in between -2 and 2, show that the roots of the equation, x^2+px+1=0 are non-real complex numbers with modulus, 1. I have shown that the roots are non-real complex numbers, but how do I show that the modulus is 1? Thank you.

Hi. I was offered the USW Most Outstanding Year 11 thing by my Year Adviser. I said that I would think about it. Does anyone know what this is about? If I take the offer, does it mean that I have to attend UWS? Has anyone got it before? Thank you.

Hi. I was on the Biki webpage with the past papers and I clicked on the past papers, such as the CSSA Trials for Chemistry, but it did not come up. Instead, a broken link came up. Did this happen to anyone? Does anyone know how to fix this? Thank you.

Hi. Does anyone know if there are any textbooks with HSC exam questions that are set out by topic. Thank you.