Add Maths June 8, 10 2010

[J.Darren]

Changing the base of a logarithm :

logc b = loga b / loga c

[destructor]

hey guys
i take add math too
u guys should focus on vectors in the cartesian form (xi+yj)
cuz i feel thats gonna show up on ppr 2 this year
someone in the previous pages was askin for a formula
the important formula for this
is position vector + time(velocity vector)= new position vector

[jellybeans]

hey guys
i take add math too
u guys should focus on vectors in the cartesian form (xi+yj)
cuz i feel thats gonna show up on ppr 2 this year
someone in the previous pages was askin for a formula
the important formula for this
is position vector + time(velocity vector)= new position vector

THANK YOU.

[ankitd_1994]

Changing the base of a logarithm :

logc b = loga b / loga c

hey Thanks for tht formula cn u also give an eg. of it with nos.?

[Ghost Of Highbury]

hey Thanks for tht formula cn u also give an eg. of it with nos.?

[Dibss]

hey can anyone who is an ex add math student or doing add math this yr, post up a list of formuale and short notes on all chapters for add math??

Hope this helps and all the best for Add Math guys

[ankitd_1994]

hey i have a doubt on rel. velocity
q. 9 in the june 2009 paper 1 (are there variants for add maths too?)

[ankitd_1994]

hey guys
i take add math too
u guys should focus on vectors in the cartesian form (xi+yj)
cuz i feel thats gonna show up on ppr 2 this year
someone in the previous pages was askin for a formula
the important formula for this
is position vector + time(velocity vector)= new position vector

is velocity vector the same as magnitude?

[ankitd_1994]

heyy anyone there?? pls answer the ques., i have posted it this time: 


9)  At 10 00 hours, a ship P leaves a point A with position vector (– 4i + 8j) km relative to an origin O,
   where i is a unit vector due East and j is a unit vector due North. The ship sails north-east with a speed
   of 10?2 km h–1. Find
   (i) the velocity vector of P, [2]
   (ii) the position vector of P at 12 00 hours. [2]
   At 12 00 hours, a second ship Q leaves a point B with position vector (19i + 34j) km travelling with
   velocity vector (8i + 6j) km h–1.
   (iii) Find the velocity of P relative to Q. [2]
   (iv) Hence, or otherwise, find the time at which P and Q meet and the position vector of the point
   where this happens. [3]

[ankitd_1994]

sry the speed is 10*[sq.rt(2)] km h^-1

[J.Darren]

There you go. Not sure about part iii though ...

[ankitd_1994]

There you go. Not sure about part iii though ...

k thx but how did u get (i+j)/ sqrt 2 in the first part n (31,43) in the 4th part??

[J.Darren]

k thx but how did u get (i+j)/ sqrt 2 in the first part n (31,43) in the 4th part??

Velocity vector = Direction vector / Discriminant of the direction vection x Speed. The boat sails north-east, hence 1 i and 1 j.

[ankitd_1994]

Velocity vector = Direction vector / Discriminant of the direction vection x Speed. The boat sails north-east, hence 1 i and 1 j.

thx +rep for the sum didnt noe the formula either

[J.Darren]

thx +rep for the sum didnt noe the formula either

LOL I actually complicated the whole matter, in the question it was stated that the boat sails with unit vector north and east, unit vector = (1, 0) if it is i. (0, 1) if it is j ...