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# Edexcel Mathematics: Mechanics M3 6679 01 - 17 May 2017 [Exam Discussion] watch

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HORRIBLE PAPER!!
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1. (Original post by .floyd.)
What did you get for the time in the last question?
I got 1.something?
2. (Original post by TrueDAN)
Thought it was pretty standard with some abstract questions - incline plane calculus was unusual and so was c.o.m. LAst part of SHM required some thought too.
The inclined plane question stumped me, so did the COM question. Bloody misinterpreted the hooke's law question in part (b)...

1.02 for 7(c)
3. (Original post by james1333)
1.02s
shm from 0.5m to -0.4m then +0.72s
yeeess!!! :d
4. Did you get F = 38.4 or 19.2?
5. (Original post by TrueDAN)
Did you get F = 38.4 or 19.2?
I got 38.4N for F
6. Was it a volume of revolution? Think I may have made a mistake
7. Incline question:
- V = 4.5 and X = 5.4 (2.s.F)
Horizontal circular motion:
- L =0.2m
Vertical circular motion:
- Sub theta = 270 to find V then resolve tension at top and you found it was larger then zero hence must be complete circles.

There were quite a few deceiving things in the paper
8. Someone posts an unofficial mark scheme????
9. (Original post by .floyd.)
I got 38.4N for F
Yeah same
10. C.O.M. = 25a/11 from O
Angle max. = 23.7°
11. (Original post by AlphaQuark)
Was it a volume of revolution? Think I may have made a mistake
It was a lamina I think. I got x=3/4 if I remember rightly.

(Original post by TrueDAN)
Incline question:
- V = 4.5 and X = 5.4 (2.s.F)
Horizontal circular motion:
- L =0.2m
Vertical circular motion:
- Sub theta = 270 to find V then resolve tension at top and you found it was larger then zero hence must be complete circles.

There were quite a few deceiving things in the paper
They sound about right. I feel like edexcel were intentionally trying to confuse...
12. these were my answers:
1a)3/4

2a)33.6
b).2

3a)4.52
b)5.42

4a)25/11 a
b)23.7

5a)show that
b)show that
c)3(ag)^0.5

6a)show that
b)38.4
c)6.53

7a)show that
b)show that
c)1.02
13. Guys, at the very end i did get the 0.3 seconds until the string snaps, but forgot to add the rest 0.72 because didnt read the question. does anybody know how much will I lose because of that?
14. wasnt F = 38.4 -mg ?
15. Yeah X =3/4
I also found Y bar which I didn't need to do - very generous 7 marker.
16. (Original post by m3isababe)
these were my answers:
1a)3/4

2a)33.6
b).2

3a)4.52
b)5.42

4a)25/11 a
b)23.7

5a)show that
b)show that
c)3(ag)^0.5

6a)show that
b)38.4
c)6.53

7a)show that
b)show that
c)1.02
All the same!
17. (Original post by TrueDAN)
Yeah X =3/4
I also found Y bar which I didn't need to do - very generous 7 marker.
I think the question asked for Y too
18. (Original post by ProdC)
Guys, at the very end i did get the 0.3 seconds until the string snaps, but forgot to add the rest 0.72 because didnt read the question. does anybody know how much will I lose because of that?
Possibly 2 marks!
19. (Original post by m3isababe)
these were my answers:
1a)3/4

2a)33.6
b).2

3a)4.52
b)5.42

4a)25/11 a
b)23.7

5a)show that
b)show that
c)3(ag)^0.5

6a)show that
b)38.4
c)6.53

7a)show that
b)show that
c)1.02
I got all of these answers too
20. Guess boundary for 90ums might be 70 or 71......

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