Edexcel FP3 June 2015 - Official Thread Watch

ninjasinpjs
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#361
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#361
(Original post by TeeEm)
start as early as possible worked for me
I mean, preparation for an exam, would the focus be on going through questions , or remembering content ect
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TeeEm
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(Original post by 13 1 20 8 42)
When I type it in I get the same expansion I had But it'd probably be worth trying to do it exact

definitely ... it also gives more plesure when you "kill" it
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TeeEm
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#363
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(Original post by ninjasinpjs)
I mean, preparation for an exam, would the focus be on going through questions , or remembering content ect


By now you should be doing pats papers (as many as you can lay your hands on) and exam style questions.
(Maths is not about remembering, particularly that close to exams.)
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rachu
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(Original post by TeeEm)
the non limit one (mathematician to be)
the limit one without substitution (engineers and physisists...)

joking

well done as they very hard
thank you. this has motivated me to get started with fp3 revision tomorrow. I am going to be a chemical engineer and I've heard there is more maths than chemistry in it .. so should be fun!
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TeeEm
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(Original post by rachu)
thank you. this has motivated me to get started with fp3 revision tomorrow. I am going to be a chemical engineer and I've heard there is more maths than chemistry in it .. so should be fun!
all the best
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ninjasinpjs
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Part C in the mark scheme makes the point that the vectors lie in the same plane, and that its a parallelogram, how can they get this information from the question/answers that i worked out?

Thanks
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TeeEm
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(Original post by ninjasinpjs)
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Part C in the mark scheme makes the point that the vectors lie in the same plane, and that its a parallelogram, how can they get this information from the question/answers that i worked out?

Thanks
crossing 2 vectors produces a vector which is perpendicular to both.
if you dot is with a third vector and you get zero this implies that this vector lies in the same plane as the first two you crossed.

so they are coplanar...

(There is another explanation with volumes...)
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physicsmaths
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#368
Tip for people who take physics and are doing FP3. axb can be figured out using right hand grip rule.


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Gome44
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(Original post by physicsmaths)
Tip for people who take physics and are doing FP3. axb can be figured out using right hand grip rule.


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Do you mean Flemings left/right hand rule? Grip rule is to do with direction of the field or something
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ninjasinpjs
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(Original post by TeeEm)
crossing 2 vectors produces a vector which is perpendicular to both.
if you dot is with a third vector and you get zero this implies that this vector lies in the same plane as the first two you crossed.

so they are coplanar...

(There is another explanation with volumes...)

ah, so if that is true, are they on the same plane and also 90 degrees to each other?

if they are on the same plane, does that mean that the tetrahedron 0ABC, has no volume since it has no vertical height.

also can i deduce that it is a parallelogram because, of part A, where the triangle has an area, so two of these OABC form a parallelogram on the same plane
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TeeEm
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(Original post by ninjasinpjs)
ah, so if that is true, are they on the same plane and also 90 degrees to each other?

if they are on the same plane, does that mean that the tetrahedron 0ABC, has no volume since it has no vertical height.

also can i deduce that it is a parallelogram because, of part A, where the triangle has an area, so two of these OABC form a parallelogram on the same plane
green is correct
red not correct
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ninjasinpjs
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(Original post by TeeEm)
green is correct
red not correct
oh i see, by the third vector you mean the perpendicular vector(e.g from a,b), so if i do the dot with the perpendicular and the final vector(c) to get 0 then all three a,b,c lie on the same plane.

You have amazing understanding! Thank you for your help
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TeeEm
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(Original post by ninjasinpjs)
oh i see, by the third vector you mean the perpendicular vector(e.g from a,b), so if i do the dot with the perpendicular and the final vector(c) to get 0 then all three a,b,c lie on the same plane.

You have amazing understanding! Thank you for your help
no worries
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cogito.
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3 out of 5 times, when i copying the vector from question to answer booklet, i copied it wrong. Today once again, and I did a whole page of cross product/matrix equations after that.
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Pri2506
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Hey
Can someone please help me with June 2014 (GCE) Question 6(a). I don't understand the use of identities in the mark scheme :/
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Thank you
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xyzmaster
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(Original post by Pri2506)
Hey
Can someone please help me with June 2014 (GCE) Question 6(a). I don't understand the use of identities in the mark scheme :/
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Thank you
They are using double angle formulas.
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ninjasinpjs
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(Original post by Pri2506)
Hey
Can someone please help me with June 2014 (GCE) Question 6(a). I don't understand the use of identities in the mark scheme :/
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Thank you
Hey bud, that was a very challenging question because of the trigonometry stuff, however the concepts are true if you keep to them you can do the question.

1) Find the gradient between the two points
2) Use the equation of the line
3) Use algebra manipulation by the factor formula in the c3 section of the book [ this is the tricky part]
4) Sub the factor formula into the question of your line, and then at the very last part apply double angle formula HINT [ Cos ( a - b) formula is used]

Hope this helps
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chughes17
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June 14 was a gift of a paper! Only really difficult question where I lost marks was the co-ordinate geometry one, with the equation of the chord. Any tips for these questions? I absolutely dread them.


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ninjasinpjs
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Is it possible to get the vector equation of a plane from the scalar form? If so, whats the method? Thanks
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ninjasinpjs
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#380
(Original post by chughes17)
June 14 was a gift of a paper! Only really difficult question where I lost marks was the co-ordinate geometry one, with the equation of the chord. Any tips for these questions? I absolutely dread them.


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Hey bro i had a bit of difficulty finding the eigenvector (1) because if any other value was used of y,z instead of x first you get a completely different vector, can you explain why?
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