Wednesday, 12 January; Mechanics 3 Examination discussion thread Watch

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jimmmy
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#21
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#21
I think I would have been better staying at home. Although I found i got 96/100 for D1 which I took in Nov.
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SunGod
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#22
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#22
You got your result for it today?
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Gaz031
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#23
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#23
As we all found it fairly difficult it stands to reason the grade boundaries will be quite low. (Or am i just trying to reassure myself)?
TBH though i would have prefered to take an easier maths exam first to give me some confidence, still, M2/D1 next week can't be any worse!
Feeling less sure about taking M4 now...
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noether
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#24
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#24
did anyone else get 0.28 seconds for question 6, the bit where the window is in the middle?
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rockindemon1
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#25
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#25
it rings a bell, i think i used x=Asinwt with x=1/2 b and then multiplied my answer by 2
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habosh
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#26
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#26
(Original post by Gaz031)
As we all found it fairly difficult it stands to reason the grade boundaries will be quite low. (Or am i just trying to reassure myself)?
...
I dont think edexcel would care about low grade boundaries .I guess they give you an A,b,c, ..etc only at IGCSE/GCSE based on boundaries
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Firelight
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#27
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#27
So with regards to time of me posting paper, what do we want?
(9 pm today or 5 pm tomorrow?)
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the_anomaly
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#28
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#28
how did u find the mass of the ball in the last question?
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the_anomaly
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#29
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#29
(Original post by XYTER)
So with regards to time of me posting paper, what do we want?
(9 pm today or 5 pm tomorrow?)
9 pm 2day definitely!
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Firelight
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#30
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#30
(Original post by the_anomaly)
9 pm 2day definitely!
I'll try and have it up by then
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the_anomaly
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#31
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#31
(Original post by XYTER)
I'll try and have it up by then
thanks
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RObTRIP
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#32
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#32
very tricky paper januray ain't been good so far for exams
p3 was also very tough
both papers are harder than any past ones i've done!
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Gaz031
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#33
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(Original post by the_anomaly)
how did u find the mass of the ball in the last question?
You have the velocity of the acrobat at the lowest point. He then catches a ball of mass m going at a given velocity towards him.
Use the conservation of momentum principle to find the an expression for the velocity(in terms of m) of the new object(particle and acrobat) after the catch. You then know that he comes to rest at the other side, so you can compare PE gain and KE loss, giving a value for m.
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rockindemon1
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#34
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#34
what about the velocity acting parallel to the radius at his finish point? for conservation you need 60x8 - 3sin60xm dont you?
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Firelight
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#35
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#35
Attached are the papers (I'm a man of my word)
Rep is not required but would be appreciated
Anyways I thought it was difficult I hope we all get the grades we deserve!
All the best
Courtesy of XYTER
Attached files
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rockindemon1
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#36
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#36
anyone been brave enough to do it getting the right answers?
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amo1
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#37
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i thiunk the last question the mass of the ball was 3kg and got the same trying it again
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rockindemon1
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#38
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btw, an awesome effort putting it up dude.
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Wagamuffin
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#39
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Noether I believe I too found 0.28 seconds or something like that (I remember finding something like 0.14 and doubling it, so 0.28 sounds about right, not certain though)

It was not an exact answe though, right?

What a crazy paper! I went in thinking I knew how to do all the questions in all the books I attempted, but somehow most of the ones I received where unique and different and as a result very hard. Kudos to Edexcel for raising the bar on exams, but why this one I desperately pray for nice grade boundaries!
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Gaz031
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#40
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#40
(Original post by rockindemon1)
what about the velocity acting parallel to the radius at his finish point? for conservation you need 60x8 - 3sin60xm dont you?
There is no velocity at the finish point. The question said they came to rest there.

Thanks for posting the paper.

Do you think the examiner will mind if I didn't do all the questions in the right order? I did the second question last o_o.
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