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    Section I - Multiple Choice

    I used the equation v=sqrt((GM)/r). That's how I worked out centripetal force in question 12. I know it sounds like a very long way of doing question 13 but I'm just wondering why i don't get the same answer as you would get using Kepler's Law of Periods... Thanks though!
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    Section I - Multiple Choice

    Hey guys, for question 13, I didn't use Kepler's Law of Periods. Instead I used v=2(pi)r/T and used the velocity from question 12. And so I got C for q. 13. Why is this method wrong, will someone tell me please?
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    Simple Harmonic Motion help please!

    That's a really well said analogy there Carrotsticks! Thanks heaps for that! I guess I can accept that maximum acceleration occurs at endpoints. Will this question of maximum acceleration ONLY be asked for simple harmonic motion?
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    Simple Harmonic Motion help please!

    Thank you very much Carrotsticks! :) Just one question, what exactly is the difference between maximum velocity and maximum acceleration? It seems the same...
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    Simple Harmonic Motion help please!

    A particle is moving in a straight line with Simple Harmonic Motion. If the amplitude of the motion is 4cm and the period of the motion is 3 seconds, calculate: i. the maximum velocity of the particle; ii. the maximum acceleration of the particle; iii. the speed of the particle when it is 2cm...
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    Sketching gradient/primitive functions

    You observe the gradient/slope of the graph given to you. If you were to sketch the primitive of the graph, for eg. if the original graph had a +ve gradient, you would draw a primitive with y">0 (concavity) so both gradients are equal.
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    integration

    Yeah forgot that was a given! Anyway I tried to use another method by letting u=sqrt(x) and it worked.
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    integration

    How did you guys know it would involve a trig substitution?
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    HSC Chemistry Questions Sorted by Topic

    Thank you very much Dylanamali! :)
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    Integration Question

    Wow Spiralflex! Thank you so much for the effort! Okay I guess substitution method does not seem to be reliable for this case, right? I'm going to adopt this new concept of integrating a sqrt function. Thank you!!! :)
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    Integration Question

    Thanks Carrotsticks. One problem though, I'm used to substitution method when splitting up the fractions. But I can't seem to apply substitution or am I not seeing a trick behind it?
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    Integration Question

    Could someone help me out on another question please? \int&space;\frac{x+1}{\sqrt{1-x-x^2}}dx
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    Integration Question

    Damn I didn't see Carrotsticks' post. Yeah I think I'm more comfortable with substitution method. Thank you SpiralFlex and everyone else who contributed. :)
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    Integration Question

    Should that really be assumed knowledge? Because I'm not familiar with it
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    Integration Question

    Thank you but how do you integrate the first part of the equation with x as the numerator using inverse trig? :S
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    Integration Question

    Please help me integrate using inverse trig \int&space;\frac{x+1}{\sqrt{4-x^2}}dx
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    3unit Integration help

    Ohhh yeah I see, I see... whatever the derivative of f(x) is, when you integrate it, it is still f(x). Thank you very much nightweaver066 for your help and your help for my other post.
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    3unit Integration help

    Thanks nightweaver066 but I have a question... can you tell me how you can integrate d/dx (xe^x)? Does the integration sign and d/dx cancel out?
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    need help (past paper question)

    Hey SpiralFlex, the answer is pi/32 not pi/12 because pi/4 will multiply with 1/8 :)
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    3unit Integration help

    How do I do the second part of this question? Can someone help me please?
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