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Original post by sam3541654

i have tried for ages and just cant do it

Which one and what have you tried?

it is w=sqrt(wx^2+wy^2)

Original post by sam3541654

it is w=sqrt(wx^2+wy^2)

Youve got to work through and simplify the expressions. The end result (in terms of v, c or theta) is relatively simple

hi ive also been trying this, what have you got so far?

Original post by panda34678

hi ive also been trying this, what have you got so far?

i honestle dont know but when i try submit the answer its incorrect

Original post by sam3541654

Not showing for me. You need to upload it to another site to share the image, then link it.

Original post by mqb2766

It helps to see the working but from a quick glance it looks about right. Id use the pythagorean identity on

v^2sin^2(theta)

and things should factorise / cancel. If not, upload your full working.

v^2sin^2(theta)

and things should factorise / cancel. If not, upload your full working.

i dont understand how to use it as i have v^2sin^2(theta) and a 2cvcos(theta)

Original post by sam3541654

i dont understand how to use it as i have v^2sin^2(theta) and a 2cvcos(theta)

sin^2 = 1 - cos^2

so ....

yeah sorry you have completely lost me i dont think i have been taught that rule and how t use it

Original post by sam3541654

yeah sorry you have completely lost me i dont think i have been taught that rule and how t use it

Its just pythagoras, if youre trying to do a question with trig/algebraic simplification you should have covered it. So

sin^2(theta) + cos^2(theta) = 1

so multply through by v^2, sub for v^2sin^2(theta) and ....

I have got c^2 +v^2cos^2(theta) - 2 v c cos(theta) divided by c- vcos(theta) but can't seem to simplify any further, can anyone help where I went wrong?

what does multiply though mean ???

Original post by panda34678

I have got c^2 +v^2cos^2(theta) - 2 v c cos(theta) divided by c- vcos(theta) but can't seem to simplify any further, can anyone help where I went wrong?

Factorize the numerator (and then simplify the fraction) so

c^2 - 2 c v cos(theta) + v^2cos^2(theta)

Ive reordered it.

(edited 5 months ago)

Original post by mqb2766

Factorize the left hand side (and then simplify the fraction) so

c^2 - 2 v c cos(theta) + v^2cos^2(theta)

Ive reordered it.

c^2 - 2 v c cos(theta) + v^2cos^2(theta)

Ive reordered it.

so you get c-2 +vcos(theta) ?

so when simplified u end up with just c

Original post by sam3541654

so when simplified u end up with just c

Have you tried entering it?

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