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

What did you get for the time in the last question?

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.

1.02s
shm from 0.5m to -0.4m then +0.72s

Did you get F = 38.4 or 19.2?

I got 38.4N for F

Was it a volume of revolution? Think I may have made a mistake

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

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

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?

Yeah X =3/4
I also found Y bar which I didn't need to do - very generous 7 marker.

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