For the two tensions I got 7.84N (or around there, can't remember) at A and 11.76N at B.
AQA Maths Mechanics 2B June 2012 Unofficial Mark Scheme
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0.0668 Correct. The rebound velocity was v = ((96-11gu)^0.5)/2
0.5mv^2 - 5,5mgu - 120e^2 /2l =0 (e=0.5)
this leads to 96-11gu /20= 2.2gu +3
which then leads to
which is, 0.0668 ( you need to do it to 3sf)
Dropped 5 marks-ish. Knowing how high the boundaries will be, I doubt it'll be an A*
The highest i have ever seen for an a* is 69 so you should be fine
Can anyone tell me what they got for part b of 6.. swinging child tenison in string one...?
(Original post by jph12)
Question one: Ski jumper
Question 3: Centre of mass
Question 4: Trig motion vectors
4a) Didn't complete. ): Hard question! I mentioned that r would never equal zero, don't know if that will get me marks.
e)Toward centre of the circle? North west?
4a - I showed that the modulus of r is always 4 and hence it must be going in a circle. I then showed that at t=0 r = 4i and at t=60 r = -4i and thus if radius is 4 then centre must be at origin. Anyone to back me up ?
4e - If something is moving in a circle about the origin then surely the acceleration must be towards the center ? Where are people getting NW from ?
Question 5: Horizontal circular motion
5c - w = 2pi/t so t = 2pi/7 and so t= 0.898 sec, no ?
Question 6: Swinging child
Question 7: Differential equation
Question 8: Elasticity question
8b - 0.668.
I will edit according to the general concensus. Some right answers for question eight, please, and the ones I couldn't do. (:
(Original post by vedderfan94)
Nice job man, I've got these:
3b) Tension at A = 18.4N, Tension at B = 1.2N
4a) I found the magnitude and showed that r always equals 4, therefore it moves in a circle. Not sure if that's right.
bii) Think I got this wrong. Correct answer seems to be 0.067 or around that :/
(Original post by SwimGood)
Also, I think I wrote North West for the direction on the vectors question
(Original post by Signed Solution)
I think in the first question there shouldn't be any newtons.
For question 8, I remember getting root(96-11gmew) or something like that and ended up with mew=0.0668.
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