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# Current Year 13 Thread (2013/14) - Mark I Watch

1. (Original post by usycool1)
QFA
Could you, or anyone present, please offer some M1 help? I am stuck on part b of what seems to be a fairly straightforward question:

Part a here:

I've tried applying f=ma on each of the car and trailer individually, and the whole system, but I can't seem to get the answer in the book (3ms^-2). Please help, this should be easy! I have been using the tension, T, as 1650N (as the stated maximum given in the Q).
2. Sweet.
The below has arrived
3. (Original post by Endless Blue)
Could you, or anyone present, please offer some M1 help? I am stuck on part b of what seems to be a fairly straightforward question:

Part a here:

I've tried applying f=ma on each of the car and trailer individually, and the whole system, but I can't seem to get the answer in the book (3ms^-2). Please help, this should be easy! I have been using the tension, T, as 1650N (as the stated maximum given in the Q).
I could help
4. (Original post by keromedic)
I could help
5. (Original post by Endless Blue)
what's the tractive force u worked out?
6. (Original post by Endless Blue)
Could you, or anyone present, please offer some M1 help? I am stuck on part b of what seems to be a fairly straightforward question:

Part a here:

I've tried applying f=ma on each of the car and trailer individually, and the whole system, but I can't seem to get the answer in the book (3ms^-2). Please help, this should be easy! I have been using the tension, T, as 1650N (as the stated maximum given in the Q).
if you do trailer independantly then won't it be 1800/600?

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7. (Original post by Endless Blue)
Could you, or anyone present, please offer some M1 help? I am stuck on part b of what seems to be a fairly straightforward question:

Part a here:

I've tried applying f=ma on each of the car and trailer individually, and the whole system, but I can't seem to get the answer in the book (3ms^-2). Please help, this should be easy! I have been using the tension, T, as 1650N (as the stated maximum given in the Q).
Consider the trailer only. When it's decelerating, the tension will act in the other direction.
8. (Original post by usycool1)
Consider the trailer only. When it's decelerating, the tension will act in the other direction.
I was trying to help . How was college?
9. (Original post by usycool1)
Consider the trailer only. When it's decelerating, the tension will act in the other direction.
wouldn't the 1650 add to the 150?

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10. (Original post by usycool1)
Yeah, I agree with you (as much as I hate to say it ), I can't really understand why it's just a week.

What was it on?
I mean if everyone forgets after the week is over, the poor sods only stay safe for a week

Chemistry to Nanochemistry in Medicine! Like drugs, the chemistry behind it, it was amazing.

Like because we understand Fischers (spelt wrong) lock and key mechanism, we know we can try to disrupt that in order to stop an enzyme working, like CuSO4 in Catalase.

So we use the principal to stop things like MRSA uses "complex chemical" to construct it's cell wall, and we use "an antibiotic" to create hydrogen bonds with it so it destroys the cell wall and can't reproduce but then it became resistant some strains (very rare, but they did so by using an ester linkage in the cell wall instead of using the NH so hydrogen bonds can't form and the two oxygens repel each other due to their electrons) so they swapped a CO for a CH2 so the mismatch wouldn't occur and that's stopped the new strain

Then he talked about heparin, how to remove it, how to detect it etc went into self assembling molecules using water and hydrophobic tails and that

I definitely want to do a degree in this now

It was good because it was chemistry and detailed and technical but I still understood it!
11. Anyone doing physics. (OCR A my exam board)

Okay so my specification states that

Electric current is a net flow of charged particles.

This is obviously correct, but my teacher believes this wouldn't get the marks in an exam.

He says we should say:

Electric current is the rate of flow of charge.

Both of these seem fine to me. The second definition seems better as it is more precise. However it isn't what is stated on the spec.

Basically, if it said 'define electric current' or 'explain what is meant by electric current', what would your answer be? Small issues like this really get on my nerves.

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12. who here will still play sport once they go to uni?
And how does everyone revise?

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13. (Original post by Qari)
if you do trailer independantly then won't it be 1800/600?

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(Original post by Qari)
wouldn't the 1650 add to the 150?

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Yes
14. (Original post by Qari)
who here will still play sport once they go to uni?
And how does everyone revise?

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Me possibly.
The normal way
15. Just seen Gravity, absolutely amazing film

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16. (Original post by keromedic)
Me possibly.
The normal way
what is the normal way?

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17. (Original post by Qari)
what is the normal way?

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Trampolining and listening to recorded podcasts through Dre beats headphones
18. (Original post by Qari)
same feel like I am getting strangled
My sympathy goes to you
What school do u go to?
19. (Original post by keromedic)
Trampolining and listening to recorded podcasts through Dre beats headphones
Never sure whether you're serious or you are joking

(Original post by Prinz655)
My sympathy goes to you
What school do u go to?
One of the many Oasis Academies you?

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20. (Original post by Qari)
Never sure whether you're serious or you are joking
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I'm joking

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