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Edexcel AS/A2 Mathematics M2 - 17th June 2016 - Official Thread

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Original post by linaxq

1.

Can someone explain how youll lose marks for sig figs

for example for lambda and c i did the fractions but wrote next to them the decimal to one decimal place and the degrees of the projectile below the hotizontal to eith 73.6 or 73.63



You lose 1 accuracy mark for rounding to the wrong degree of accuracy. When you use g, you should give values to 2sf or 3sf. If they ask for it rounded to a certain degree otherwise they'll ask, otherwise I used two.

For g questions they only penalise this once per question.
Original post by smartalan73
what numbers did you use to get that angle? 0.83 and ?

You have to look at the shape of the object to work out 66.4 its 45 +arctan 0.83: the opposite or adjecent side of the triangle. Since the triangle is isoceles with 45 degrees angle.
Original post by linaxq

1.

Can someone explain how youll lose marks for sig figs

for example for lambda and c i did the fractions but wrote next to them the decimal to one decimal place and the degrees of the projectile below the hotizontal to eith 73.6 or 73.63



COM didnt want any decimals. Anything where you used 9.8 should be to 2 S.Fs but they allow 3 S.Fs. any more than that means no marks.
Original post by Rgrewall
Didnt it say "in the third second" hence implying the integral had limits 4,3


1st second: 0-1
2nd second: 1-2
3rd second: 2-3
Reply 364
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Reda2
14
Original post by Squishy•
You would need 70


70 marks for C3 and C4? If you can, please explain.
Thanks
Original post by Rgrewall
Didnt it say "in the third second" hence implying the integral had limits 4,3


3 rd second is 2-3, since 0-1 , 1-2 is 2 seconds:smile:
Poll for the UK paper: http://www.thestudentroom.co.uk/showthread.php?t=4171568
Do errors get carried forward? Like I used 0.x instead of X for a calculation and it changed all my answers up
Original post by cjlh
1st second: 0-1
2nd second: 1-2
3rd second: 2-3


Oops
how many marks do you think i'll lose for b and c if i got lambda wrong in 6a but then did the right method onwards?
Original post by ChilliLemon
100% in the bag my friend!!!


Yeah man 100% but i failed so hard in fp2 -15 marks. So i have to do well in fp3, what about you? Any more exam?
Reply 371
Avatar for linaxq
linaxq
2
Original post by NinjaOtter
COM didnt want any decimals. Anything where you used 9.8 should be to 2 S.Fs but they allow 3 S.Fs. any more than that means no marks.


so 73.3 and 10.44 no marks?
Original post by kingaaran
Yeah I got this too - you're right :smile:


I'm pretty sure this is wrong.

0-1 is the 1st second.
1-2 is the 2nd second.
2-3 is the 3rd second.

So if you integrate between 2 and 3 you get 11/3m.
Reply 373
Avatar for linaxq
linaxq
2
Original post by cjlh
You lose 1 accuracy mark for rounding to the wrong degree of accuracy. When you use g, you should give values to 2sf or 3sf. If they ask for it rounded to a certain degree otherwise they'll ask, otherwise I used two.

For g questions they only penalise this once per question.


so 73.3 and 10.44 no marks?
Original post by cjlh
1st second: 0-1
2nd second: 1-2
3rd second: 2-3


what annoys me is that I did that first then crossed it out
Did anyone else get 1.22 as their distance for the centre of mass?
Original post by linaxq
so 73.3 and 10.44 no marks?


73.3 is right but 10.44 is wrong
Reply 377
Avatar for SHJBHB
SHJBHB
1
Original post by cjlh
You lose 1 accuracy mark for rounding to the wrong degree of accuracy. When you use g, you should give values to 2sf or 3sf. If they ask for it rounded to a certain degree otherwise they'll ask, otherwise I used two.

For g questions they only penalise this once per question.


For Q4a) I got the 0.8299 but managed to round it to 0.823 so will I just lose the 1 accuracy mark or will they see the 0.8299 and not look past it as it's the correct answer
Original post by NinjaOtter
what annoys me is that I did that first then crossed it out

So did I! I almost wish i didn't check my paper now
Reply 379
Avatar for linaxq
linaxq
2
Original post by Khoinet
73.3 is right but 10.44 is wrong

is 10.4 right ? are you talking about the value being wrong or sig figs

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