Edexcel C4 June 2016 - Unofficial Markscheme

Original post by fefssdf

Hey was part 8E to find the area of the triangle ?

Yup, 8E was the area of the triangle question

Reply 542

Original post by irahman786

Yup, 8E was the area of the triangle question

I ended up with the area as 24/5 and not 12/5 so do you think I'd still get 1 mark seeing as I must have just multiplied through by a 2 for some reason ?

Reply 543

Original post by fefssdf

I ended up with the area as 24/5 and not 12/5 so do you think I'd still get 1 mark seeing as I must have just multiplied through by a 2 for some reason ?

Depends, what method did you use? I did 1/2 * Root 8 * Root 8 * 3/5 . If you did something similar you should get 1 mark

Reply 544

Original post by irahman786

Depends, what method did you use? I did 1/2 * Root 8 * Root 8 * 3/5 . If you did something similar you should get 1 mark

Yep I did 1/2 AB sin C for this.. I'm guessing I copied one of the sides down incorrectly -_-.. Hopefully I wrote down the sides right and just made an error with my calculator

Reply 545

Original post by fefssdf

Yep I did 1/2 AB sin C for this.. I'm guessing I copied one of the sides down incorrectly -_-.. Hopefully I wrote down the sides right and just made an error with my calculator

Yeah then i dont see why you shouldnt pick up one mark.

Reply 546

Original post by irahman786

Yeah then i dont see why you shouldnt pick up one mark.

ah hopefully the examiner is nice - also for the trapezium rule question I used the incorrect height and so my answer was wrong...
I need these 2 marks cause I want like 94 ums in this argh
out of the whole paper - the bits i mess up are the area of a triangle and trapezium rule -_-

Reply 547

Original post by fefssdf

ah hopefully the examiner is nice - also for the trapezium rule question I used the incorrect height and so my answer was wrong...
I need these 2 marks cause I want like 94 ums in this argh
out of the whole paper - the bits i mess up are the area of a triangle and trapezium rule -_-

You'll probably get 2 marks out of 3 for the trapezium rule losing just the A1 mark. If youre unlucky you'll get 1

Reply 548

kennz

8

On question 6b I got lambda = 16 because I took sqrt4 out as a factor from the top and bottom of the fractions instead of cancelling to one so this doubled my value of lambda. my answer to part c was just double the real answer so how many marks would i lose? I reckon 1-2 for 6b and 1 for part c due to follow through marks. Then in 8e i got lambda = plus minus 2/5 but substituted this into the equation that varies with lambda and ignored the starting vector, would i lose 1 mark or 2 marks here?

Reply 549

apple9296

Original post by ShatnersBassoon

Grade boundaries are not released until the day before results day. Most people on here have estimated the 90 UMS/A* boundary to be between 67 and 71 out of 75.

i think i just about got an A*...

got 71/75 in c3 and 68/75 c4 :biggrin:

wasn't that much of a difficulty paper.. anyone doing OCR physics ??

Reply 550

kennz

8

Original post by apple9296

i think i just about got an A*...

got 71/75 in c3 and 68/75 c4 :biggrin:

wasn't that much of a difficulty paper.. anyone doing OCR physics ??

OCR B?

Reply 551

Original post by irahman786

You'll probably get 2 marks out of 3 for the trapezium rule losing just the A1 mark. If youre unlucky you'll get 1

Hmm I hope so but I can see it being A1 for finding the height and then M1 for using the rule and then the last A1 for the answer ...

Can you tell me how the height was actually calculated cause I can't remember how I ended up with 5/2

Reply 552

username1997mk

if you get the wrong integral, do you lose all the marks, like for example, In 6c) instead of integrating sin squared x I differentiated by accident, do I still get marks for like substituting the limits etc?

Reply 553

EdwinLangley

2

For the implicit differentiation question part a I got an answer that was incidental but both the numerator and bottom were multiplied by -1. When you substitute values in you get the same answers but do you think I'd have lost any marks for presentation?

Reply 554

NamelessPersona

3

Could have potentially got 100 UMS but I'm worried as I made a mistake on 3 and had to go back to fix it. I got the right answer but the working was very scruffy so they may not be able to read it.

Reply 555

Jahmed228

Question, for volumes of revol I Only worked out total volume (formed by everything under the curve), forgot to take away from the cyclinder (was a 4 mark question) how many marks would I drop there?

Also on the last question Finding Co ords of E, In the last minute I found in my calc that lambda = +-2/5, I wrote that its those values and wrote the corresponding co ords, however I didn't show me getting -+ 2/5, how many marks (out of 5) would I drop?

Thank you!

Reply 556

kprime2