Re: HSC 2015 4U Marathon
True, probably too easy.Difference of two volumes?
True, probably too easy.Difference of two volumes?
I just don't kno what to do at all...^ Do you have a problem visualising the solids of revolution and their slices/shells?
Just a simple question, for questions like:
Is the outer radius 2+x or 2-x?
I have new senior maths the examples are so good but i cant to the questions that involve two radii^ Do you have Cambridge 4U? That may help since they have pretty solid examples you can follow, if you're struggling, then go back to 2U and revise (and try to understand) the ideas behind basic volumes of solids of revolution. This can help form a basis on which you can strengthen your ability to solve 4U problems (even the basic ones).
Maybe check some maths videos, e.g. Khan Academy or PatrickJMT.I have new senior maths the examples are so good but i cant to the questions that involve two radii
NOWW I UNDERSTAND WHAT IT MEANS BY INNER AND OUTER (mind blown)Maybe check some maths videos, e.g. Khan Academy or PatrickJMT.
E.g. here's one from PatrickJMT: https://www.youtube.com/watch?v=E5OOMbz5jZk
For this, the inner radius is the distance from the y-axis to the nearer half of the parabola, and the outer radius is the distance from the y-axis to the further half of the parabola.now i need to know how you do a question where like this where theres two areas or 2 annuli:
dw got it
Using the method of cylindrical shells to calculate the volume of this solid is the answer :
do u mean the answer IS 17pi/6 ?dw got it
I got 77pi/30. My integral was:do u mean the answer IS 17pi/6 ?
lol you did the same thing i did interpreted it asdo u mean the answer IS 17pi/6 ?