Guest Posted June 9, 2004 Share Posted June 9, 2004 Did anyone do this topic today? Im doing further maths and its one of the easier papers. I found it OK, got a bit stuck on the ladder question, finding the coefficient of friction. Also, on the very last question i ran out of time when finding h. Tom Link to comment Share on other sites More sharing options...
Arnaudt Posted June 9, 2004 Share Posted June 9, 2004 Yeah I did ... found it not too bad - got 0.16 if I remember for the co-efficicnet of friction and h was around 15 if I remember - not too bad ... but i messed up the first q. Link to comment Share on other sites More sharing options...
syphern Posted June 9, 2004 Share Posted June 9, 2004 This is OCR MEI board right?? Yes it was hard indeed but i used tan72 to get the coeff of friction, somehow you rearrange F=uR to Rsin72/Rcos72 and that cancels out the R and you are left with tan72. I got like 3. something for the u. anyway i dont think i did too bad, i counted my certain marks at the end and it was about 70%. Yeah i didnt have time either to work out h. Link to comment Share on other sites More sharing options...
Guest Posted June 9, 2004 Share Posted June 9, 2004 (edited) i worked out ive only ost 3-4 marks on the last part (coefficient of friction) and 1 or 2 marks on the last question (finding h) its not tan72 lol. mu has to between 0 and 1. I almost worked it out. It was 1/2tan72 1 / (2 tan(72 degrees)) = 0.162459848 You had to resolve the forces and then find R by taking moments about A. (Moment of the weight) - then do muN = friction blah blah I think. Tom Edited June 9, 2004 by Guest Link to comment Share on other sites More sharing options...
El Bourricot Posted June 9, 2004 Share Posted June 9, 2004 aaaaaaaaaarg got 0.9 for mu!!! Now you've scared me :| That mech 1 paper was hard though! Mech 2 as well not as much though. Last question had bitch algebra. I'll do the question tomorrow in the lesson probably. Should we post it up here for board members to have a go? Come on. Anyone saved a paper? ;) Link to comment Share on other sites More sharing options...
Guest Posted June 9, 2004 Share Posted June 9, 2004 Which question, the ladder one? I can remember it i think. You've got this ladder, its resting against a SMOOTH, vertical wall (x metres high), inclined to the horizontal at 72 degrees, resting on ROUGH, horizontal ground. The ladder has a weight, W. Draw a diagram showing the forces acting and find a value for the coefficient of friction (mu). Enjoy :) - first part is easy - 2nd part gets a bit tricky. Link to comment Share on other sites More sharing options...
El Bourricot Posted June 9, 2004 Share Posted June 9, 2004 They didn't give you any values for the ladder though - I made up my own but not sure bout whether that would work :s The tricky question was the one with h though, centre of mass of that composite object. That and the impulse spacecraft question. In fact, the whole paper was hard. Oh well there's still the January retake :p Link to comment Share on other sites More sharing options...
Guest Posted June 9, 2004 Share Posted June 9, 2004 Impulse was 75000Ns (J = mv-mu) Average Force = 1000N Then the seperate speeds (last part) were 139ms-1 and 149ms-1 I hope Link to comment Share on other sites More sharing options...
syphern Posted June 9, 2004 Share Posted June 9, 2004 i worked out ive only ost 3-4 marks on the last part (coefficient of friction)and 1 or 2 marks on the last question (finding h) its not tan72 lol. mu has to between 0 and 1. I almost worked it out. It was 1/2tan72 You had to resolve the forces and then find R by taking moments about A. (Moment of the weight) - then do muN = friction blah blah I think. Tom Actually mu can be above 1!! But I guess at our stage they restrict it. Anyway i did the M1 paper too, God was that hard! I got stuck on the very 1st question you have no velocity or mass and they say work out f=ma!!! Only a distance is given. Link to comment Share on other sites More sharing options...
Guest Posted June 9, 2004 Share Posted June 9, 2004 ouch - I did mechs 1 in january and got 95% :) I was speaking to the standard maths students and they found Mechs 1 really hard aswell - they didnt like the 1st question either :s - but that should mean that the grade boundary goes down. Link to comment Share on other sites More sharing options...
El Bourricot Posted June 9, 2004 Share Posted June 9, 2004 Who cares about the grade boundary, ultimately what happens is they add up your marks for all the modules - so it's better to get easier papers on which you score more, then when they add them up you get your high A. Link to comment Share on other sites More sharing options...
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