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

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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).

Reply 7321

Kvothe the Arcane

Sweet.
The below has arrived
2013-11-20 20-27-18.411.jpg

Reply 7322

Kvothe the Arcane

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 could help :wink:

Reply 7323

Endless Blue

Original post by keromedic

I could help :wink:

Please do. :tongue:

Reply 7324

Kvothe the Arcane

Original post by Endless Blue

Please do. :tongue:

what's the tractive force u worked out?

Reply 7325

Qari

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:

if you do trailer independantly then won't it be 1800/600?

Posted from TSR Mobile

(edited 10 years ago)

Reply 7326

usycool1

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:

Consider the trailer only. When it's decelerating, the tension will act in the other direction. :smile:

Reply 7327

Qari

Original post by usycool1

Consider the trailer only. When it's decelerating, the tension will act in the other direction. :smile:

wouldn't the 1650 add to the 150?

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Reply 7328

Kvothe the Arcane

Original post by usycool1

Consider the trailer only. When it's decelerating, the tension will act in the other direction. :smile:

I was trying to help :angry:

. How was college?

Reply 7329

L'Evil Fish

Original post by usycool1

Yeah, I agree with you (as much as I hate to say it :colonhash:

), I can't really understand why it's just a week. :tongue:

What was it on? :teeth:

I mean if everyone forgets after the week is over, the poor sods only stay safe for a week :mmm:

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 :colonhash:

It was good because it was chemistry and detailed and technical but I still understood it!

Reply 7330

Hilton184

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.

Posted from TSR Mobile

Reply 7331

Qari