#pure trig A2

33 messages · Page 1 of 1 (latest)

astral current
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just part b and c

static latch
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for part b, i assume its where 5cos(x/3) = 5 and where -8sin(x/3) = 8 as those are the largest values you can get out of them

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so T=1100+5+8=1113

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and to work out x

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wait

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u need the Rcos(theta+alpha)

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im bad w that im not working that out

astral current
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wait I’ll send my part a

signal blaze
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For part b you know that the max value of T occures when cos(x/3 + 1.10122) = 1

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So to find the x value you solve that

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that gives you -3.03659 which is outside the range

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Maximums occur every 2pi

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so you need to add on 2pi*3 to -3.03659

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that gives you 15.8129 as x value

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To get the max value of T

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its 1100+rt89

signal blaze
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For part c)

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im shit at this bit but

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so let T=1097

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solve the equation

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You should get them

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What I did was I first found out how long 24 hours was

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I knew it was on the second negative bump and it was at -0.9 (around there)

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Using that fact I knew that T=1097 only happened 3 times

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Then I found the value which is the hard bit

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For the first two I knew they repeated every 6pi

astral current
signal blaze
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its 2pi*3 because its cos(x/3)

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which multiples the period by 3

astral current
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Oh shoot

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I get you