Doesn't matter I've figured it out(Original post by Shadez)
I'm stuck on question 5b from this exercise sheet:http://www.madasmaths.com/archive/ma...gs_springs.pdf
The answer is 1.65m
Here's what I've done could someone point out where I went wrong
Attachment 432841
Attachment 432841432843![]()
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AQA A2 Mathematics MM2B Mechanics 2 - Monday 22nd June 2015 [Exam Discussion Thread] watch
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- 20-06-2015 18:10
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- 20-06-2015 18:20
Can anyone try to explain question 5 from january 2012 please?
http://filestore.aqa.org.uk/subjects...B-QP-JAN12.PDF
Edit: I read the question wrong, I thought it was going down a hill instead of around a bend :/Last edited by samlyon; 20-06-2015 at 18:26. -
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- 20-06-2015 18:29
(Original post by samlyon)
Can anyone try to explain question 5 from january 2012 please?
http://filestore.aqa.org.uk/subjects...B-QP-JAN12.PDF
f<=uR but for max speed, centripetal force is max so friction is max so
uR=mv^2/r
R=mg so
umg=mv^2/r
you can see the mass cancels so 'm' is not required
ug*r=v^2
v = root(ugr)
sub in the values and find vLast edited by sum1random; 20-06-2015 at 18:30. -
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- 20-06-2015 18:33
(Original post by sum1random)
Centripetal force in the case of the parcel is provided by friction cause surface is rough
f<=uR but for max speed, centripetal force is max so friction is max so
uR=mv^2/r
R=mg so
umg=mv^2/r
you can see the mass cancels so 'm' is not required
ug*r=v^2
v = root(ugr)
sub in the values and find v -
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- 20-06-2015 19:17
We wont lose marks for using column vectors as opposed to using the i and j format aren't we? Because i and j require so much more effort to work with than column vectors.
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- 20-06-2015 19:21
(Original post by Jetraft87)
We wont lose marks for using column vectors as opposed to using the i and j format aren't we? Because i and j require so much more effort to work with than column vectors. -
JackNorman
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- 20-06-2015 20:31
Why are the grade boundaries for M2 so high 😩 I don't understand, it's quite a big step up from M1 in my opinions and the grade boundaries are so much higher
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CD223
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- 20-06-2015 20:35
(Original post by JackNorman)
Why are the grade boundaries for M2 so high 😩 I don't understand, it's quite a big step up from M1 in my opinions and the grade boundaries are so much higher
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- 20-06-2015 21:12
Can u explain 9c to me, please? I do not get where the cos 2theta come from.
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CD223
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- 20-06-2015 21:28
(Original post by ike96)
Can u explain 9c to me, please? I do not get where the cos 2theta come from.
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- 20-06-2015 22:08
Hey can someone do question 9 part c june 2014 i dont understand how they got 2.04m
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- 20-06-2015 22:08
june 2013*
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CD223
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- 20-06-2015 22:23
(Original post by olatee)
Hey can someone do question 9 part c june 2014 i dont understand how they got 2.04m
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- 20-06-2015 23:01
For Jan 09 question 7b, how do they expect me to know the angle.....
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- 20-06-2015 23:44
Thanks for the video.
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- 21-06-2015 00:22
(Original post by Tiwa)
For Jan 09 question 7b, how do they expect me to know the angle.....
=r-rcostheta
this is cause the angle the vertical line makes with the radius line at point B is theta as well (alternate angles)
where theta is the angle between radius at A and radius at B
so r-rostheta = 2m (height)
rearrange to get theta=60degLast edited by sum1random; 21-06-2015 at 00:25. -
CD223
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- 21-06-2015 09:51
Can anyone quickly go over the rules needed for a complete circle in each situation?
Bead on a wire
Ball in a cylinder
Ball on a hill
Ball on a string
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- 21-06-2015 12:32
Im so confused as to how to work this out, supposedly the answers are Ta = 24.2N and Tb = 4.6N.
If anyone can help out I would be massively grateful - I've wasted an hour trying to figure it out haha. -
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- 21-06-2015 12:46
Has anyone done Question 7 on page 136 Exam style practice papers in the M2 textbook?
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- 21-06-2015 13:01
(Original post by undead345)
Has anyone done Question 7 on page 136 Exam style practice papers in the M2 textbook?
https://wordery.com/mechanics-2-for-...FQsCwwodKhEARQ
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