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Edexcel AS/A2 Mathematics M1 - 8th June 2016 - Official Thread

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Original post by Not_a_horse
https://drive.google.com/file/d/0B1ZiqBksUHNYbDBBREF2ek9oUVk/view?pref=2&pli=1
Question 3, if I find W first then use it to calculate R, will I still get full marks, because the mark scheme says not.


@Zacken
Is this true? :/ I assume you'd want to calculate W to find R ...
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Avatar for Wongsta
Wongsta
In our working out do we need to show the steps to solve quadratic equations or can we just our calculator to get the answer for it
Original post by fpmaniac
I dont understand what you do sorry. What do you o with the v


Okay tell me which part you dont understand out of these steps...

r= (5-3t)i + (t-3)j

When moving parallel, it has to be moving directly right or left, for example, (5i 0j)

so the j component must equal zero

t-3 = 0
t=3 when moving parallel
Original post by Not_a_horse
https://drive.google.com/file/d/0B1ZiqBksUHNYbDBBREF2ek9oUVk/view?pref=2&pli=1
Question 3, if I find W first then use it to calculate R, will I still get full marks, because the mark scheme says not.


Uhhhhh, I just spent like 10 minutes trying to see how you can do it without doing part ii first and I just checked the mark scheme... It doesn't say anywhere that you can't find W first????????? kik.JPG
Original post by Marccs
Can anyone help me with this question on vectors

Use the formula - velocity = speed x direction x (1/magnitude of direction) then use r=ro + vt
Original post by Wongsta
In our working out do we need to show the steps to solve quadratic equations or can we just our calculator to get the answer for it


Best to show how you got the answer (whether that be by factorisation, completing the square or quadratic formula).
Original post by Someboady
@Zacken
Is this true? :/ I assume you'd want to calculate W to find R ...


No, lol, of course you'd get the marks...
Original post by Wongsta
In our working out do we need to show the steps to solve quadratic equations or can we just our calculator to get the answer for it


Show your working.

Original post by Don Pedro K.
Uhhhhh, I just spent like 10 minutes trying to see how you can do it without doing part ii first and I just checked the mark scheme... It doesn't say anywhere that you can't find W first????????? kik.JPG


You'll get the marks if you find W first.
Original post by candol
part a) suvat
s=h
A=-9.8
t=5
u=20

partb)
Find V using suvat for the first ball
You can now work out 3/4 v for the second ball
Do suvat with v=3/4V, u=w, a=9.8, s= height found from part a


thanks :smile:
Original post by Don Joiner
Can anyone do this momentum/impulse question?

The mark scheme shows:

33/5mu = 2m(-v--4u)

I don't get how they've got both the 4u and the v as negative since the question States P is moving due east?

I can't make sense of it


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question?
Original post by KloppOClock
question?


Dam I forgot; here:

ImageUploadedByStudent Room1465326559.440596.jpg


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Original post by Zacken
Show your working.



You'll get the marks if you find W first.


Yeah, the OP claimed that the mark scheme would not allow you to find W first before finding R :P
What happens when it says 'when C is at the point of tilting'??
Original post by NigelK98
What happens when it says 'when C is at the point of tilting'??


the reaction at the other support (not c) is zero
Original post by Don Joiner
Dam I forgot; here:

ImageUploadedByStudent Room1465326559.440596.jpg


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Yeah P is moving due east but it can be convinced to move due west with enough force from Q right..
Original post by NigelK98
What happens when it says 'when C is at the point of tilting'??


Nigel is that you??
Original post by Don Joiner
Can anyone do this momentum/impulse question?

The mark scheme shows:

33/5mu = 2m(-v--4u)

I don't get how they've got both the 4u and the v as negative since the question States P is moving due east?

I can't make sense of it


Posted from TSR Mobile

They set west as the positive direction, you can set east as positivw direction and you'd get the same answer
Original post by Marccs
Can anyone help me with this question on vectors


Watch this video, it'll help you :biggrin: http://www.examsolutions.net/maths-revision/mechanics/vectors/exam-questions/velocity/tutorial-2.php
Original post by Don Joiner
Dam I forgot; here:

ImageUploadedByStudent Room1465326559.440596.jpg


Posted from TSR Mobile


img033.jpg
Original post by metrize
They set west as the positive direction, you can set east as positivw direction and you'd get the same answer


But I don't get how the velocity of p can be the same before and after


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