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Applies Maths. how was it for YOU?
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20-06-2008 4:55pm#1
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I needed an A1 and only prepared 5 questions so it was pretty much the disaster I deserved.
Did okay, but didn't get the 100 points I need for any course I'm interested in.
Q1 - Oh sweet merciful Jesus, what a Q!
Q2 - Part (a) was grand. Part (b) was the same sort of thing that came up in the mock. Got 50/50 there but just didn't finish the trig here. Projectiles, I was counting on you! :eek:
Q5 - Nice question.
Q6 - Didn't prepare circular motion or SHM really. Wrote nothing for part (a). Part (b) was nice enough. I just did it with my physics knowledge of CM, I think my method was sound...?
Q8 - Great question.
Q10 - More awkward than usual... hate messy differential equations. :mad: It was nice enough though. 0 -
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Nicest exam of the whole Leaving Cert, IMHO!!!
Q.1 - Oh my God, could we have asked for a nicer question. So simple I thought at first that I was missing something, and no sign of velocity/time graphs, thank God!
Q.3 - Nice enough, part a took me a while to work through, but part b was lovely.
Q.4 - Part a was sinch, took me all of 5 mins, part b was tough enough, but I think I got it out. Did anyone else get g x (square root of 3) over 19 as the acceleration?
Q.5 - Not quite sure if I got the second part of part a exactly right, but hopefully it's ok. Part b was lovely.
Q.8 - Omg, I actually nearly screamed with joy when I saw this question, torque is the only topic within Moments of Inertia that I really understand, and it saved me from having to do Q.2. A question though: was it just me or was the fact that v=1m/s totally superfluous? I didn't use it at all! I hope I didn't screw it up big time.
Q.10. Grand, even though I got some very big figure for P, I think it was like 3,200,000 kW! Anyone else get that? Got v=15, so hopefully that's right too.
Overall, great, I think I might have squeezed out an A1 on this one! 0 -
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its was grand,ya. What did ye all get? heres some of mine;
Q3. A; got it out, B; k=4
Q5. A; (i) V_a=1-e , V_b=(1-e^2)/2 , V_c=(1+e)^2 /2 B; got it out
Q6. A; (i) a=-100x (ii) v= 1.683 , a=10.81 B; W=(3g/2)^1/2 rad s^-1
Q7. A; Tan(alpha)=7/4 B; (mu)=2/3
Q8. A; proof B; (i) 5g/26 (ii) 62g/13 and 63g/13 (did any1 get anything like these? Im not sure how correct they are.)
Q10. A; x=1 B; (i) P=3,200 (ii) v_1=15m s^-1
I hope theres a few matches out there now :P....
Bu besides that,were finished!!!!!!!!! WHOOOOOOOOOOOOOOO!!!!!!!!!!!:):):):D:D
As regards Q8. B and using the speed,the only way I was able to do it was to use the speed :P. I used it to find the displacement undergone as potential energy was changed to knetic energy, then I used that distance wit " v^2=u^2 = 2as " to get the "a".How did ye do it?!0 -
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its was grand,ya. What did ye all get? heres some of mine;
Q3. A; got it out, B; k=4
Q5. A; (i) V_a=1-e , V_b=(1-e^2)/2 , V_c=(1+e)^2 /2 B; got it out
Q6. A; (i) a=-100x (ii) v= 1.683 , a=10.81 B; W=(3g/2)^1/2 rad s^-1
Q7. A; Tan(alpha)=7/4 B; (mu)=2/3
Q8. A; proof B; (i) 5g/26 (ii) 62g/13 and 63g/13 (did any1 get anything like these? Im not sure how correct they are.)
Q10. A; x=1 B; (i) P=3,200 (ii) v_1=15m s^-1
As regards Q8. B and using the speed,the only way I was able to do it was to use the speed :P. I used it to find the displacement undergone as potential energy was changed to knetic energy, then I used that distance wit " v^2=u^2 = 2as " to get the "a".How did ye do it?!
I got the same for 3 and 5, didn't do 6 or 7, but I got very different stuff for Q8b. I think I got g/6 for acceleration, and I got 5g for one of the tensions, and I can't remember what the other one was in terms of g, it was 47.something when I worked it out though.
Oh, by the way, there was a specific formula for 8b, it was like L=I(angular acceleration). It's the Q.8 version of F=ma.
Damn, I screwed up somewhere in 10b(i), I had and extra three zeros onto that answer! Oh well...all done now!!! 0 -
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I was tired/lazy and lost interest in using App Maths for points so I only prepared like 4 questions..
Q1 was fine,except for b (iii) which i didn't get for some reason.
Q2 (A) was grand, I got 64 metres, (B) I think I got wrong, it ended up being a few pages but I got E11S.
Q3.. couldn't get part A, got 4 for k.
Q4a.. Got a similar answer to that in the paper, with 2 instead of 4. (b) I drew the diagrams and wrote a few equations and gave up.. I had an idea how to do it.. but I hadn't practised any 2 sided wedge ones so I didn't bother going any further..
Q10.. was good enough, I got 3200kW, 30.53 m/s
Ah.. Sure Il be happy with a C3 really.. I was either going to be counting this or french and french went fine so this was out...HeartieDevil wrote: »Damn, I screwed up somewhere in 10b(i), I had and extra three zeros onto that answer! Oh well...all done now!!!
You didn't screw up, its 3200kW, 3200000W. I left it in W's with all the zero's0 -
A nice paper I thought, but for some reason I was freaking out at the start, did question 10 in like five seconds, later found out I misread the last part
Q1 was nice
Q2 part a was nice, part b I got something 55 degrees something (only wrote down 55)
Q3 (a) anohter misread catastrophe, I was doig the range for it. And redid it like 3 times till I saw it was max height, got it then. Got K=4
Q4 a was nice, for b I got 2.57 as the acceleration of the wedge, but I'm not sure how accurate that was, I was pretty flustered for the entire exam, so I'm sure it's filled with littel mistakes
Q5 nice question,a nd fives have always been my favourite
Q9 didn't get most of(b) got r=2 cm or something, (a) was fine
Q10 Started here, was overexcited I guess, misread the last question.. hopefully it's only minus one or something
maybe putting P in watts is risky, as it was PkW not PW , but it's not physics, I doubt they would take marks
I guess the leaving cert is dumbing down, there was not one freakishly hard question0 -
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Q1: a part was a doddle, meant to go back to biii at the end but ran outta time
Q2: Can't remember my answers, but got most of it out
Q3: Got the first part and got k= 4 for the second part
Q4: Fecked up the wedge, but got the first part...what equations did people get for the wedge thing?
Q5: graaand
Q10: a, fine, got 14.98 or something for the second part.
Overall i was happy enough.
It's OVER!!! 0 -
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I messed that exam up so much. didnt do too bad tho...
can someone check my answers????
Q1
4s
83.3m
9/24 m/s^2
48 m/s
525 m
Q2
1.5i -2j
64 m
9i-3j (I didnt see that they wanted direction so i left it in vector form. how many marks would i lose?????????)
Q3
got down to the trig but messed up when subbing in and didnt go back to it.
k=4
Q5
cant remember, a load of e's
i just bull****ted for this.
got this out in the dying minutes
Q6
a=-100x w=10
v=168.31 cm/s
a=1080 cm/s^2
I drew the diagrams for this and got a load of eqautions but never got around to prooving it. how many marks would i get for the diagrams and the basica equations etc... ?????
Q10
i messed this up, i hadnt done maths in so long, that i didnt recognaise the tan inverse!!!!! i knew it wasnt working out so i purposesly made a 'slip' so it would give me a nice answer. how many marks would i lose?????
P=3200KW
v1=15
(that last part was sooo good. I was looking at the numbers on my calculator thinking ffs, this is not going to work out. then igot some some number and got the cube root of it and out popped 15.000000021 YES!!!!!)
I made a balls of some questions but i made an attempt at everything and did the first few steps of every question i didnt get. I just rlly wanna know how many marks you lose for the slips etc that i mentioned above. I really need at least a B3 in this exam!!! plz can someone tll me if you're not already drunk.... woo it's over! 0 -
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