Heres a scan of what I did about 30 minutes ago. You've made a slip early on by the looks of it. http://i.imgur.com/wvbe6.jpg
It tells you D is 15 metres from B. You already worked out AE and that was 25. So you know the length of the direction vector (which is AE) is 25. Since you only need to move 15 you work this out as a fraction of the direction vector's length which is 3/5 giving you your lambda. It's all to do with the lines being parallel.
I still don't quite understand but thanks for helping
You know in the June 11 paper, the vectors question about the horizontal plane... can someone please explain to me why it was that? also what are the other vectors for other planes, like the vertical one
You know in the June 11 paper, the vectors question about the horizontal plane... can someone please explain to me why it was that? also what are the other vectors for other planes, like the vertical one
please help!
That's because its a horizontal plane... the point for horizontal and vertical will always be (0,0,1)
You need to find the value of t and plot it in the x equation.. So t=y/4 plot it in x equation u get 2(y/4)^2 which will give u x=y^2/8 take the 8 to the other side which gives you 8x=y^2
To find the volume of revolution, since its rotating about the x axis u will use the formula pie (integrate) y^2 we know that y^2 is 8x so all u do is integrate 8x The limit would be 0 and 4 because in the question they have told you that t is between rt -2 and rt 2 by plotting rt 2 in x equation 2(rt2)^2 which is 4 The answer is 64 pie
You need to find the value of t and plot it in the x equation.. So t=y/4 plot it in x equation u get 2(y/4)^2 which will give u x=y^2/8 take the 8 to the other side which gives you 8x=y^2
To find the volume of revolution, since its rotating about the x axis u will use the formula pie (integrate) y^2 we know that y^2 is 8x so all u do is integrate 8x The limit would be 0 and 4 because in the question they have told you that t is between rt -2 and rt 2 by plotting rt 2 in x equation 2(rt2)^2 which is 4 The answer is 64 pie
If it was rotated about the y axis would you sub rt 2 into y?
If it was rotated about the y axis would you sub rt 2 into y?
ty for this
Not really it depends on the equation.. It would be a good idea to get the value of t which is the easiest... when it says rotate about the y axis the formula will be pie (integrate) x^2 and the limits will be the values on the y axis...