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# m3 - shm watch

1. This is the question:

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The head of a piston moves with SHM of amplitude 0.1root 3m about a mean position O. How far from O is the head of the piston when it is travelling with a speed equal to half its maximum speed.

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Is there really enough information in the question to be able to do this?
2. (Original post by maggiehodgson)
This is the question:

-----------------------------------

The head of a piston moves with SHM of amplitude 0.1root 3m about a mean position O. How far from O is the head of the piston when it is travelling with a speed equal to half its maximum speed.

-------------------------------------------------------------

Is there really enough information in the question to be able to do this?
AFAIK, yes. Why do you think there isn't? Call the maximum speed v. Then

Then you want to find x s.t (or something vaguely like that)
3. (Original post by Zacken)
AFAIK, yes. Why do you think there isn't? Call the maximum speed v. Then

Then you want to find x s.t (or something vaguely like that)
AFAIK??
4. (Original post by TeeEm)
AFAIK??
As far as I know
5. (Original post by Zacken)
As far as I know
danke
6. (Original post by Zacken)
AFAIK, yes. Why do you think there isn't? Call the maximum speed v. Then

Then you want to find x s.t (or something vaguely like that)
Yes, you are dead right. I just hadn't gone far enough with my own work to see how to eliminate w.
7. (Original post by maggiehodgson)
Yes, you are dead right. I just hadn't gone far enough with my own work to see how to eliminate w.
Great. Yeah, that's always a thing with these questions, lots of terms cancel out. Especially in stuff like circular motion where mass cancels out at the very last step and you breathe a sigh of relief.
8. (Original post by Zacken)
Great. Yeah, that's always a thing with these questions, lots of terms cancel out. Especially in stuff like circular motion where mass cancels out at the very last step and you breathe a sigh of relief.
Thanks for the warning - I think that's the next chapter. Oh Joy!
9. (Original post by maggiehodgson)
Thanks for the warning - I think that's the next chapter. Oh Joy!
It's a fun one, to be honest. The 'show that' questions are a free 6/8 marks. Enjoy it, make sure you know your energy principles well.
10. (Original post by Zacken)
It's a fun one, to be honest. The 'show that' questions are a free 6/8 marks. Enjoy it, make sure you know your energy principles well.
Believe it or not I'm only doing mechanics for fun. I'm a mature student, self teaching. I did A level - also self taught - two years ago. Having been out of education and exams for many many years I almost scared myself to death and wished I'd never put myself through the terror of the exam room. I swore I'd never do such a thing ever again.

So mechanics for fun. I must be a masochist.
11. (Original post by maggiehodgson)
Believe it or not I'm only doing mechanics for fun. I'm a mature student, self teaching. I did A level - also self taught - two years ago. Having been out of education and exams for many many years I almost scared myself to death and wished I'd never put myself through the terror of the exam room. I swore I'd never do such a thing ever again.

So mechanics for fun. I must be a masochist.
I can relate with the self-teaching thing, seems like you're doing good, from what I've seen of you so far! So keep at it. Being a masochist is fun. Are you planning on doing M4/5 as well?
12. (Original post by Zacken)
I can relate with the self-teaching thing, seems like you're doing good, from what I've seen of you so far! So keep at it. Being a masochist is fun. Are you planning on doing M4/5 as well?

Well. We'll see. At the current rate of progress I might not even get to the end of M3 hahahha.

However, if I do, given that beating my head on a brick wall is preferable to daytime tv/housework/statistics/decision mats etc, then probably yes.

Thanks for the encouragement. Without TSR it would have to be daytime TV and housework. God forbid.
13. (Original post by maggiehodgson)
Thanks for the encouragement. Without TSR it would have to be daytime TV and housework. God forbid.
Ah, that's what we're for!

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