OCR Maths (MEI) M1 2014

I am so confused regarding this A* stuff... everyone says something different....

If you average an A in AS units and 90% overall in A2 does that mean an A*? And does it mean that you have to score 90% in M2? Or does that just have to be an A as long as C3 and C4 are A*?! Sorry if that doesn't make sense! I am just so confused.

Only two conditions:

Get 180/200 in C3 + C4
Get 480/600 in A Level Maths overall

Reply 41

Surf

15

Original post by Law-Hopeful

Only two conditions:

Get 180/200 in C3 + C4
Get 480/600 in A2 Maths overall

Awesome! Thanks very much... :biggrin:

Reply 42

Moon1ight

15

for c4 and c3 guys is the final mark the cw (c3) or comprehension (c4)+ the paper mark ?

Reply 43

Surf

15

Original post by krishkmistry

for c4 and c3 guys is the final mark the cw (c3) or comprehension (c4)+ the paper mark ?

I think it is yes.

Reply 44

emfp21

Jan 2012 q2ii anyone?

Posted from TSR Mobile

Reply 45

Necrosyrtes

4

The thing I am least looking forward to on tomorrow's exam is the questions where they ask you to explain something. I always fail to mention something which I don't think is really relevant to a good explanation but the mark scheme says that you must mention it. Hopefully luck is on my side tomorrow and for whatever 'explainy' question there is I will be able to get all the marks. The other stuff I'm fine on and barring the odd mistake in adding for example, I can get mainly full marks on those.

Reply 46

Necrosyrtes

4

The thing I am least looking forward to on tomorrow's exam is the questions where they ask you to explain something. I always fail to mention something which I don't think is really relevant to a good explanation but the mark scheme says that you must mention it. Hopefully luck is on my side tomorrow and for whatever 'explainy' question there is I will be able to get all the marks. The other stuff I'm fine on and barring the odd mistake in adding for example, I can get mainly full marks on those.

Original post by emfp21

Jan 2012 q2ii anyone?

Posted from TSR Mobile

You have a right angled triangle, known angles, a known force (i.e. one side) and two forces you want to find. You can use trig functions like sin(x) = o/h to work out the values of the tensions.

Reply 47

KanKan

11

Original post by emfp21

Can someone outline and help me somehow with vector triangles etc?

Posted from TSR Mobile

Loool, these will be the death of me!

Just leaving it to change tbh :/

Reply 48

tsrking

Original post by Surf

For june 05:

Because R = (-18i + 3j)

It wants the angle to the +ve i direction (and this shows negative value of i) therefore it is:
arctan(3/18) = 9.5
180-9.5 = 170.5 = 171 (to 3sf)

And as for jan 13, 7vi:
You need to show how it hangs in equilibrium by showing the tensions in each string. In this case it involves calculating the angle CAB (you could solve another one and prove it that way). From which you can resolve vertically and prove that T1cos(CAB) = 50
and that T1 = 50, and therefore there is no tension in T2....

I hope that makes sense....

Yh but why cant it be 180+9.5 instead of 180 minus, cant you go clockwise instead of anticlockwise. Also i dont get the CAB thing, what is the angle CAB, how do u work it out, are u supposed to use lengths when working out pythagoras because i always thought you had to use tensions???

Reply 49

Right-handed

5

Original post by tsrking

Yh but why cant it be 180+9.5 instead of 180 minus, cant you go clockwise instead of anticlockwise. Also i dont get the CAB thing, what is the angle CAB, how do u work it out, are u supposed to use lengths when working out Pythagoras because i always thought you had to use tensions???

for most maths questions the line y=0 is 0 degrees and the line x=0 is 90 degrees so thats why you go anticlockwise.
so for example 9.-9 would be -45 degrees and not 45 degrees.

for the other thing you have lengths 0.5, 2.3 and 2 from what i can remember from the question. you can use the lengths of the wires to find the angles. you can use cosine rule probably seems tedious but you probably do have to find CAB to prove that there is slack. i would just say "there is slack in the longest wire" cause i'm lazy like that but it is 3 marks so...

Reply 50

Moon1ight

15

For q2 part 2 - why do you have to add the intial position and velocity together ? And following on what does velocity in vector form mean ? http://www.mei.org.uk/files/papers/m110ja_4761.pdf

Reply 51

khiz

Original post by Necrosyrtes