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# Wjec m3 2016 watch

1. How'd people find this one? I thought the SHM part a.) Was pretty weird, but I think it went well.
2. I agree I thought it was a pretty standard paper and that part a of SHM was weird. I got an answer in the end unsure if it's right but I tried
3. (Original post by GPeach1)
I agree I thought it was a pretty standard paper and that part a of SHM was weird. I got an answer in the end unsure if it's right but I tried
By assuming x = 0 when t = 0, I got it into the form A = -(W^2)x
Saying that x = 0 at the centre of the motion and the amplitude is A meters.

I was a bit unsure of the amplitude, because I felt like it wanted a value, but since that was the standard differential equation for SHM I assumed that if I could get a numerical value for A (Given that they gave no numbers in the question) that would imply all SHM system have the same amplitude, so I just left it at A meters.

What did you get for x on the last question?
4. Bumpidy bumpidy, bumpidy boo!
5. (Original post by WhisperingTide)
By assuming x = 0 when t = 0, I got it into the form A = -(W^2)x
Saying that x = 0 at the centre of the motion and the amplitude is A meters.

I was a bit unsure of the amplitude, because I felt like it wanted a value, but since that was the standard differential equation for SHM I assumed that if I could get a numerical value for A (Given that they gave no numbers in the question) that would imply all SHM system have the same amplitude, so I just left it at A meters.

What did you get for x on the last question?
Yes I got the same to prove it was SHM then I said that x=0 but so (-Asinwt) =Bcoswt so B/-A=tanwt but because B and A are both the amplitude which is constant I let that equal -1 so I got wt= minus pi over 4 and then I think I substituted it into my original equation letting x=0 nd got root2 over 2 for amplitude but it seemed wrong and I think I got 5.58 if I remember rightly but again I was a little unsure because I think I added in an extra force in the wrong place to make it work but oh well it is done now

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