Mechanics M2 (6678)

[Evolution]

How are you preparing for this exam guys, it's on the 31st so not much time left.
Post your questions and inquires here, so that we can help each other.

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by the way sorry about the typo in the poll.

 

[étudiante]

Centre of mass help anyone please.....

 

[Evolution]

http://www.google.com/url?sa=t&rct=...mYCpCg&usg=AFQjCNFXLanT38rO2XrxLtEsuBYD5XHtNA

 

[étudiante]

View attachment 11552



Can someone explain part b please Evolution

 

[Evolution]

sec

 

[étudiante]

sec

tyt np... n thanks
its Jan 2007 btw...

 

[étudiante]

Just wanted to ask, what if someone fails in one unit but the overall total comes to a B? is it given as B or is the whole qualification put as uncleared?

 

[Evolution]

ofc you get a B. It would be retarded if they let you fail a whole subject just because of one unit.

 

[étudiante]

ofc you get a B. It would be retarded if they let you fail a whole subject just because of one unit.

YaY den! thanks SOOO much!!! ^_^

 

[Evolution]

lol don't aim for that though, always aim for that a star, by the way I'll help you with that question in a bit, read the marking scheme and see if you can understand it before I'm done with what I'm doing lol

 

[étudiante]

not aiming but just to be on the safe side i wanted to know... thanks
n sure np! tyt

 

[Unkownbunny]

Hiya everyone. I have a question and i was hoping you would help me out !
M2 june 2009 Q 7b
I would be very grateful if you could me, thanks in advance xx

 

[étudiante]

sorry to bother again, but this one please....
Thanks

 

[Evolution]

you know how to do a right? you just split the shape up into two right triangles at the sides, and a rectangle in the middle, and find the centre of mass. or you can split it up into three equilateral triangles,
and for B wait lol I didn't read the question right.

 

[étudiante]

sure np

i guess the markscheme says to split it into 3 triangles :S cuz if we split it in triangles and rectangle den we dont get ne equillateral triangles right? :S

 

[Evolution]

OK B is easy as well, all you gotta do is calculate the center of mass with point D as the origin, if you did that already in part A, then just draw the horizontal distance between D and the c.o.m and the vertical distance between D and the c.o.m and the direct distance between D and the c.o.m. You will have a right angled triangle, just use SOHCAHTOA to find the angle (tan in this case)

 

[étudiante]

Thanks soooooooo much! :,)

 

[Evolution]

sure np

i guess the markscheme says to split it into 3 triangles :S cuz if we split it in triangles and rectangle den we dont get ne equillateral triangles right? :S

No, it's up to you how to split it up, as long as it's right I didn't really understand what you meant, but you can do that part in different ways =)
and no problem at all, I love to help

 

[étudiante]

No, it's up to you how to split it up, as long as it's right I didn't really understand what you meant, but you can do that part in different ways =)
and no problem at all, I love to help

oh i see... what i meant to ask was umm.. the formula we use for triangles is for an equilateral triangle right? or all triangles??

dats so nice of u

 

[Evolution]

come on, come on gimme more questions )
by the way here is a site that has all the papers and mark schemes, I just came across it http://www.jonesthesum.greenhill.pembrokeshire.sch.uk/html/m2_past_papers.html

Hiya everyone. I have a question and i was hoping you would help me out !
M2 june 2009 Q 7b
I would be very grateful if you could me, thanks in advance xx

I'm really sorry, I didn't see your post, hang on a sec.