Post by: ~~~~shreyapril~~~~ on October 31, 2009, 10:26:34 am
where i is a unit vector due east and j is a unit vector due north. Because of the constant wind which is
blowing, the flight takes 4 hours. The velocity in still air of the plane is (250i + 160j) kmh–1. Find the
speed of the wind and the bearing of the direction from which the wind is blowing.
this quesiotion has stuck me up!!!
help!!
ans is 112(app.)
at 333o acc. to ms
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 10:57:57 am
no one here is providing me wid that!!! :( :(
Post by: Ghost Of Highbury on October 31, 2009, 10:59:06 am
250i + xi + 160j + yj = 300i + 160j
xi = 50i
yj = -100j
refer to the diagram
angle XON = 90 - XOZ
XOZ = tan-1 2 = 63.4
therefore XON = 26.6
the bearing wud be the reflex angle i.e 360-26.6 = 333.4
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:01:14 am
freaking answer!!
how do you manage it dyude???
Post by: Ghost Of Highbury on October 31, 2009, 11:03:55 am
cool
freaking answer!!
how do you manage it dyude???
read the add. math book and solve the papers.
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:04:49 am
i'll try to do so!!
chal then will be bak wid few more doubts!!
haha
dont mind answering them rite??? :P :P
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:21:31 am
question no. 10 lst part!!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:26:03 am
bachaooooo...!!!
Post by: Ghost Of Highbury on October 31, 2009, 11:32:12 am
2002 oct
question no. 10 lst part!!
gr8 then!
no need to explain everything!
u already have one equation for OQ which u found out in ii
now..u know that OQ = OA + AQ
substitute the value for AQ in this eq.
now, u have 2 values for OQ in the form of a,b, lamda and u
compare the co-efficients of a and b to find the value of those 2 constants
Post by: @d!_†oX!© on October 31, 2009, 11:34:47 am
AP = 1/3 b -a
OA + AB = OB
AB = b - a
AM = 1/2 b - 1/2 a
OA + AM = OM
OM = a + 1/2 b - 1/2 a
OM = 1/2 a + 1/2 b
ii)THEREFORE, OQ = (i dunno how to put dt symbol here[M TAKING IT AS y])(1/2a + 1/2b)
iii)AQ = (another symbol[M TAKING IT AS x])(1/3b - a)
iv)OA + AQ = OQ
a + x/3 b - xa = y/2a + y/2 b
dude even m confused wat to do next????
anyone there???
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:38:37 am
By the way thanx aadi
nd toxic thanx for firt explanation!!! :P :P
Post by: Ghost Of Highbury on October 31, 2009, 11:41:31 am
COMPARE THE CO-EFFICIENTS!!
FIRST REARRANGE
a(1-x) + x/3 b = y/2 a + y/2 b
now
1-x = y/2
y = 2-2x
--
bx/3 = by/2
x/3 = y/2
2x = 3y
2x = 6-6x
8x = 6
x = 3/4
substitute to find the value of y/ i am bored~
Post by: Ghost Of Highbury on October 31, 2009, 11:42:10 am
toxic no need this much!!
By the way thanx aadi
nd toxic thanx for firt explanation!!! :P :P
ahh..thats k..
abbe..isko chod...solve all relative velocity first..yeh chindi hai!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:42:42 am
hihih
huhuh
bored doing add. math???
great i think you are the fisrt to get so!!!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:43:54 am
ahh..thats k..trying to find them!!
abbe..isko chod...solve all relative velocity first..yeh chindi hai!
but have got only one in p2 till now
i have done all p1 questions
so no use doing them again!!!
Post by: Ghost Of Highbury on October 31, 2009, 11:51:33 am
haha
hihih
huhuh
bored doing add. math???
great i think you are the fisrt to get so!!!
generally bored
Post by: @d!_†oX!© on October 31, 2009, 11:52:21 am
Thanks aadi
nd shrey i had already done the question till the time u posted it....
anyways....uss samey dimaag kahin aur tha isliye i cudnt know wat to do next...
it was easy thoug...a he says"chindi" hahaha
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:52:28 am
this is the ussual case when we get long big hols of 3 days btwnexams!!
we are really confused abt wat to do!!!
Post by: Ghost Of Highbury on October 31, 2009, 11:54:24 am
ohhh
Thanks aadi
nd shrey i had already done the question till the time u posted it....
anyways....uss samey dimaag kahin aur tha isliye i cudnt know wat to do next...
it was easy thoug...a he says"chindi" hahaha
yea..lol..t was CHINDI!...
hey adi!..u watch socceR?
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 11:56:32 am
i guess he supports manchester!!!
Post by: @d!_†oX!© on October 31, 2009, 12:33:51 pm
By the way not so often...as in i don't FOLLOW it but yeah..i take some regular updates....
nd for manchester....dude i like that team cuz i always wen i choose that team on soccer games on my XBOX 360
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:35:06 pm
how do u know i do????dude the reality is tha manchester is gonna loose this time
By the way not so often...as in i don't FOLLOW it but yeah..i take some regular updates....
nd for manchester....dude i like that team cuz i always wen i choose that team on soccer games on my XBOX 360
come in sport thread not over here!!!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:38:24 pm
1, 2, 3, 4, 5 and 6 if no digit can be used more than once?
toxic dude or ne body answer this!!!
saw ms
it said 4*(5*4*3)
explain why??
Post by: @d!_†oX!© on October 31, 2009, 12:40:44 pm
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:46:22 pm
which paper is this???
winter (oct/nov) 2008!!!
Post by: @d!_†oX!© on October 31, 2009, 12:47:54 pm
which paper...which question???
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:49:30 pm
baapre!!!
gussa hai kya!!!????
haha lolzzz ;D ;D
Post by: @d!_†oX!© on October 31, 2009, 12:52:26 pm
anyways...is this a question of permutation and combination???
seems so...
dude i haven't done it so far....
i'll still try nd will let ya know
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:54:54 pm
no prbs!!
jaldi bhej!!
aadi ka kuch pata chala!!
i guess usko reply nahin karneka hai!!!
Post by: astarmathsandphysics on October 31, 2009, 12:57:07 pm
1, 2, 3, 4, 5 and 6 if no digit can be used more than once?
toxic dude or ne body answer this!!!
saw ms
it said 4*(5*4*3)
explain why??
the first number has to be one of 3,4,5,6
5 choices for the 2nd number
4 for the 3rd
and 2 for the 4th
Post by: @d!_†oX!© on October 31, 2009, 12:59:29 pm
can't it be 3124???
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 12:59:47 pm
or 3??/
if two then it must be *2!!!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 01:00:37 pm
y is 3456 the first number sir???
can't it be 3124???
dude they asking number above 3000 so it must be 3,4,5,6
how can it be 1,2,3???
just think!!
Post by: astarmathsandphysics on October 31, 2009, 01:02:15 pm
1, 2, 3, 4, 5 and 6 if no digit can be used more than once?
toxic dude or ne body answer this!!!
saw ms
it said 4*(5*4*3)
explain why??
the first number has to be one of 3,4,5,6
5 choices for the 2nd number
4 choices for the 3rd
and 3 choices for the 4th
hence4*5*4*3
as soon as the first number is picked you only a have a coice of 5 etc
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 01:03:09 pm
but then what abt the markscheme!!
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 01:04:50 pm
only 4 for 1st thing
then 5 for 2nd
4 for 3rd
and 3 for 4th!!!
just have a look!!
am i right!!
Post by: astarmathsandphysics on October 31, 2009, 01:06:29 pm
Post by: ~~~~shreyapril~~~~ on October 31, 2009, 01:07:49 pm
kk
got it sir!!
have got my add. math exams in next to next week
but still "practice makes man perfect..!!"
Post by: astarmathsandphysics on October 31, 2009, 01:22:12 pm
Post by: Ghost Of Highbury on October 31, 2009, 04:24:01 pm
arre, y u breaking ur head soo much in these questions
just draw 4 boxes...and rite the down the possibilities..4,5,4,3 multiply them
bas!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 10:48:01 am
good trick!!
kk
By the way i did not understand wat u teling??
meine post dekha nahin??!!! ??? ??? ???
Post by: Ghost Of Highbury on November 01, 2009, 10:48:41 am
hmm!!
good trick!!
kk
By the way i did not understand wat u teling??
meine post dekha nahin??!!! ??? ??? ???
nuthing
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 10:49:25 am
sending spam!!! :P :P
only one word!!! :P :P
way is this!!??? :D :D
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 11:34:38 am
banks 200 m apart. The motor boat, which has a top speed of 6ms–1 in still water, travels directly from
a point A on one bank to a point B, 150m downstream of A, on the opposite bank. Assuming that the
motor boat is traveling at top speed, find, to the nearest second, the time it takes to travel from A to B.
here i am wid anther wierd question!!
i had told aadi i'll post it!!
it took time to search!!
Post by: @d!_†oX!© on November 01, 2009, 11:40:08 am
temme if i shud continue
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 11:42:24 am
will the diagram look like this???
temme if i shud continue
hm!!
looking at the question i think so!!
Post by: @d!_†oX!© on November 01, 2009, 11:44:14 am
Post by: @d!_†oX!© on November 01, 2009, 11:50:51 am
my answer comes to 22.36 seconds....
i shall show u my working if dts rite....
Post by: astarmathsandphysics on November 01, 2009, 11:51:45 am
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 11:52:02 am
did not uderstand ne thing!!so check this!!!
http://www.freeexampapers.us/IGCSE/Additional%20Maths/CIE/2004%20Nov/0606_w04_ms_2.pdf
question no.8
Post by: Ghost Of Highbury on November 01, 2009, 11:54:48 am
A motor boat travels in a straight line across a river which flows at 3ms–1 between straight parallel
banks 200 m apart. The motor boat, which has a top speed of 6ms–1 in still water, travels directly from
a point A on one bank to a point B, 150m downstream of A, on the opposite bank. Assuming that the
motor boat is traveling at top speed, find, to the nearest second, the time it takes to travel from A to B.
here i am wid anther wierd question!!
i had told aadi i'll post it!!
it took time to search!!
ok..i have solved it..will answer it..
making the diagram is shitty man!!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:00:45 pm
it takes time in paint!!
soi suse paint.net!!
a better soft!!and i guess some wat similar to photoshop!!
attached!!
but u need some additional soft like .net framework!!
if they ask forit download from microsoft site!!
they will auto direct you!!
Post by: Ghost Of Highbury on November 01, 2009, 12:01:37 pm
all explanations in the diagram.
hope u get it.
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:02:39 pm
attached
all explanations in the diagram.
hope u get it.
great name for the image!!!
Post by: Ghost Of Highbury on November 01, 2009, 12:02:57 pm
will the diagram look like this???
temme if i shud continue
lol..no adi..its not that way! :P
Post by: Ghost Of Highbury on November 01, 2009, 12:03:52 pm
attachedBy the way,..the markscheme diagram is not like this...but its the same concept..its just an inverted way.. :P
all explanations in the diagram.
hope u get it.
Post by: Ghost Of Highbury on November 01, 2009, 12:09:16 pm
great name for the image!!!did u understand?
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:10:47 pm
did u understand?
trynig to will tell ya abt in some time!!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:15:16 pm
great solution!!
good waY!!
i guess this is it!!
thanx dude!!
i guess astar reaches home quickly!!!
he can give some other way!!!
Post by: @d!_†oX!© on November 01, 2009, 12:17:31 pm
lol..no adi..its not that way! :Pyaya aadi
...
i got it...
the answer i gave earlier was actuall the angle which i gave as the answer by mistake...
i got the answer myself too..had to change my previous diagram...but ya...its a pretty cool question...
think u took the advantage of me disappearing suddenly...i had some work...
@shreycool... u got more question like this???i like these types!!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:21:05 pm
i will search for them in my text book!!
Post by: Ghost Of Highbury on November 01, 2009, 12:22:15 pm
yaya aadi
...
i got it...
the answer i gave earlier was actuall the angle which i gave as the answer by mistake...
i got the answer myself too..had to change my previous diagram...but ya...its a pretty cool question...
think u took the advantage of me disappearing suddenly...i had some work...
@shreycool... u got more question like this???i like these types!!
WHAT?!?!
hahaha...wat advantage?...i simply solved it and posted it...as if i was waiting for an answer from u..
Post by: @d!_†oX!© on November 01, 2009, 12:23:52 pm
dont take it to heart dude....
all i said was in gud humor that i was gonna post the answer but u did it cuz i went...so i said dt u tuk advantage....
lolzz....y do u get offended by everything man....just chill!!!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:24:25 pm
i guess you both were trying to compete the first one!!
this wasnt a competion !!
just someone answered it!!!
not someone, aadi ..
Post by: Ghost Of Highbury on November 01, 2009, 12:24:48 pm
got it!!
great solution!!
good waY!!
i guess this is it!!
thanx dude!!
i guess astar reaches home quickly!!!
he can give some other way!!!
yea..thats k.. ur welcome
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:31:15 pm
it is meant for students to understand!!
not for them!!
Post by: @d!_†oX!© on November 01, 2009, 12:32:21 pm
as if the the file says "Students' mark scheme"
dude it is meant for teachers only naa
Post by: Ghost Of Highbury on November 01, 2009, 12:33:13 pm
i dont know why these cie people give such difficult solutions in ms!!!
it is meant for students to understand!!
not for them!!
its the same concept...u can draw however u like..
By the way...sticking to the topic...there is a high probability of a relative velocity question for oct/nov 2009...
solve the sums from the book too!...hoo soo thong ..khor nyak yong! phew!! :P
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:35:24 pm
so i thnk we must tell them to keep aadi as one of these!!!
he really makes a quite good diagram!!
Post by: Ghost Of Highbury on November 01, 2009, 12:36:50 pm
i guess ven teachers cannot understand that question's answer as told by those goras!!!!
so i thnk we must tell them to keep aadi as one of these!!!
he really makes a quite good diagram!!
By the way...paint.net is awesome!~ thanks for the setup
i liked the text option...wud be easier for me to make diagrams now...
Post by: @d!_†oX!© on November 01, 2009, 12:37:32 pm
@aadi wat does the last sentence mean???(ur reply)
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:39:31 pm
it is just simmilar to photoshop!!
and also occupies less spacE!!!
so dont thank me!!
thank sam!!he gave me a year ago!!
i thought you had it!!!
By the way he means that it is easier to write in it now!!
as paint had some difficluties!!
go it??
Post by: @d!_†oX!© on November 01, 2009, 12:40:53 pm
"hoo soo thong ..khor nyak yong!"
now u got it???
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:45:59 pm
these are the people who have written good add. math books!!
and i guess they are amongst the bests!!!
now??
Post by: @d!_†oX!© on November 01, 2009, 12:47:37 pm
By the way cool names man!!!!!!
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:48:27 pm
the best at maths!!
but i think after Indians!!!
Post by: @d!_†oX!© on November 01, 2009, 12:49:35 pm
have to be below indians yaar!!!
indians are without any doubt THE BEST at maths
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 12:58:46 pm
answer this one!!
i guess it is easy!!
but still try!!
Post by: Ghost Of Highbury on November 01, 2009, 01:00:07 pm
kk
answer this one!!
i guess it is easy!!
but still try!!
u really want it to be solved?..or..just...tp ke liye daala hai?
Post by: @d!_†oX!© on November 01, 2009, 01:04:51 pm
x + y = 12 2 (squared)
x2 - y2 = 60
x2 + y2 = 144
=>2x2 = 204
=>x2 = 102
=> x = 10.1
y = 1.9
Post by: Ghost Of Highbury on November 01, 2009, 01:11:45 pm
x2 - y2 = 60 1
x + y = 12 2 (squared)
x2 - y2 = 60
x2 + y2 = 144
=>2x2 = 204
=>x2 = 102
=> x = 10.1
y = 1.9
i dont think thats the answer
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 01:12:08 pm
the ans is 3.5
i guess the mistake was that x2 = y2 = root60
not 60!!
then it wll be x2 = y2 = 7.75
and x2 + y2 =144
then 2x2=151.75
so x=8.7!!
and y=3.9!!!
i guess this is riter now!!
@ aadi - if you wanted ti then you cud have solved it!!!
Post by: Ghost Of Highbury on November 01, 2009, 01:13:56 pm
you are wrong !!!
the ans is 3.5
i guess the mistake was that x2 = y2 = root60
not 60!!
then it wll be x2 = y2 = 7.75
and x2 + y2 =144
then 2x2=151.75
so x=8.7!!
and y=3.9!!!
i guess this is riter now!!
@ aadi - if you wanted ti then you cud have solved it!!!
i already solved it
Post by: Saladin on November 01, 2009, 01:14:34 pm
Thus, the logic behind it goes back to ancient history, before the Indians and far before the koreans. I used to think like that, but then i met smart British people. That changed everything. Its just that they don't show themselves out that much, because a lot of people say that the west lives on stolen money from the east, like the british colonies etc. But that is not true, the people of nobilic birth and understanding still are doing well. The overall students of rich countries show a negative trend, because now education is accessible to everyone. Since the governments of these respective countries like America and Britian have tried to make it available to everyone, the quality has gone down, and now they public schools, apart from a slight few are redundant institutions.
So the people who do well are always a minority because being educated takes time, patience and resilience.
I understand that you may back urself up with stats, but to be honest, its not about statistics, its about the real deal. Like the school i go to is almost the same as urs, they dont teach anything. But, there are private and far more expensive schools for the nobles, or mordernly called the 'rich'. Which will give ppl quality education. See, things really have not changed from mideaval ages, they have become more complex.
Post by: Ghost Of Highbury on November 01, 2009, 01:17:03 pm
I know u r wrong AADI, becasue I know indians are not the best. In fact no particular race is the best at math, mathematics is a complex system that was crafted and created by pretty much everyone.
Thus, the logic behind it goes back to ancient history, before the Indians and far before the koreans. I used to think like that, but then i met smart British people. That changed everything. Its just that they don't show themselves out that much, because a lot of people say that the west lives on stolen money from the east, like the british colonies etc. But that is not true, the people of nobilic birth and understanding still are doing well. The overall students of rich countries show a negative trend, because now education is accessible to everyone. Since the governments of these respective countries like America and Britian have tried to make it available to everyone, the quality has gone down, and now they public schools, apart from a slight few are redundant institutions.
So the people who do well are always a minority because being educated takes time, patience and resilience.
I understand that you may back urself up with stats, but to be honest, its not about statistics, its about the real deal. Like the school i go to is almost the same as urs, they dont teach anything. But, there are private and far more expensive schools for the nobles, or mordernly called the 'rich'. Which will give ppl quality education. See, things really have not changed from mideaval ages, they have become more complex.
apparently , i am "aadi".... the one which u r referring to is "adi" or "adi_toxic"
Post by: @d!_†oX!© on November 01, 2009, 01:18:29 pm
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 01:18:47 pm
arre we were just jking!!
its our EADA moto!!
and pla dont motivate us to start all those rot again!!!
Post by: Saladin on November 01, 2009, 01:21:22 pm
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 01:22:16 pm
you really rock to change the topic and all those stuff!!!
Post by: @d!_†oX!© on November 01, 2009, 01:22:29 pm
Post by: @d!_†oX!© on November 01, 2009, 01:22:56 pm
Post by: ~~~~shreyapril~~~~ on November 01, 2009, 01:38:24 pm
so have any good question post them here!!
math or add. math both wud do!!
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 07:36:56 am
Post by: sameer210394 on November 07, 2009, 10:27:53 am
have got one question just scaning to post it!!
were's ur question ... hah
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:30:58 am
A plane flies from P to Q where
?
PQ = (960i + 400j) km. A constant wind is blowing with velocity
(–60i + 60j) km h–1. Given that the plane takes 4 hours to travel from P to Q, find
(i) the velocity, in still air, of the plane, giving your answer in the form (ai + bj) km h–1, [4]
(ii) the bearing, to the nearest degree, on which the plane must be directed. [2]
here!!!
thi is not what i had t ask!!
but at the momnet igot this!!
i amseraching my pc for that question!!
Post by: nid404 on November 07, 2009, 10:31:58 am
Post by: @d!_†oX!© on November 07, 2009, 10:32:18 am
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:33:30 am
add. math paper not yet over it is there on 13 and 11 also!!
Post by: Ghost Of Highbury on November 07, 2009, 10:34:16 am
to bhi nahi mila to bol.
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:37:45 am
this is the original doubt i had!!
i tired it but i got ans as 1.3 sec wheas in proving it must be 1.8!!!
help!!
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:39:16 am
each time wid diff method!!
Post by: nid404 on November 07, 2009, 10:40:50 am
velocity would be 240i+100j km/hr
and bearing would be 22.62o
correct me if im wrong
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:42:16 am
to the previous thing u postedok!!
velocity would be 240i+100j km/hr
and bearing would be 22.62o
correct me if im wrong
first part was easy!!
how did ya get second on??
Post by: Ghost Of Highbury on November 07, 2009, 10:45:58 am
sry that 24 is 240
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:49:18 am
attacheddue hoe did you make 24 ka 240???
dint get it!!??
and from where did ya get 300 and 40 explain!!
Post by: nid404 on November 07, 2009, 10:49:37 am
Post by: Ghost Of Highbury on November 07, 2009, 10:50:33 am
yeah gotit!!!!!
this is the original doubt i had!!
i tired it but i got ans as 1.3 sec wheas in proving it must be 1.8!!!
help!!
alien Spacecraft:
-> (12j) + (40i + 15j)(t)
=> (40t)i + (12 + 15t)j
the missile
=> (46i) + (ki +30j)(t-0.5)
=> (46 + k(t - 0.5))i + (30(t-0.5))j
t has to be t - 0.5 here because it left 0.5 seconds after the alien spacecraft
(40t)i + (12 + 15t)j = (46 + k(t - 0.5))i + (30(t-0.5))j
12 + 15t = (30(t-0.5))
12 + 15t = 30t - 15
27 = 15t
t = 1.8
@shrey - sry, that is 240
300 and 40 ..i got it from the vector Vp
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:53:45 am
alien Spacecraft:
-> (12j) + (40i + 15j)(t)
=> (40t)i + (12 + 15t)j
the missile
=> (46i) + (ki +30j)(t-0.5)
=> (46 + k(t - 0.5))i + (30(t-0.5))j
t has to be t - 0.5 here because it left 0.5 seconds after the alien spacecraft
(40t)i + (12 + 15t)j = (46 + k(t - 0.5))i + (30(t-0.5))j
12 + 15t = (30(t-0.5))
12 + 15t = 30t - 15
27 = 15t
t = 1.8
@shrey - sry, that is 240
300 and 40 ..i got it from the vector Vp
ok!!
got it!!
thanx a loads!!!
Post by: nid404 on November 07, 2009, 10:54:19 am
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:54:49 am
i got the ans!1
and you had tried too..!!
Post by: @d!_†oX!© on November 07, 2009, 10:55:04 am
woow man...gr8 invention!!!
Post by: Ghost Of Highbury on November 07, 2009, 10:55:28 am
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 10:56:21 am
"THANKS A LOADS"????thanx for this also!!! :P :P
woow man...gr8 invention!!!
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 02:19:16 pm
Given that a= 5i - 12j and b = pi+j. Find,
i) the unit vector in direction of a.???
Post by: sameer210394 on November 07, 2009, 02:20:54 pm
hey i have another question!!
Given that a= 5i - 12j and b = pi+j. Find,
i) the unit vector in direction of a.???
abbe chal paka mat, tujhe itna bhi nahi aata ?? :P
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 02:32:28 pm
Post by: nid404 on November 07, 2009, 02:36:55 pm
hey i have another question!!
Given that a= 5i - 12j and b = pi+j. Find,
i) the unit vector in direction of a.???
I didn't really get the question. Do you have to express the vector as a unit vector?? I mean if O is the origin and OA is 5i -12 j then express this as a unit vector......im not gettin it :-\
Post by: nid404 on November 07, 2009, 02:38:10 pm
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 02:39:20 pm
pls dude!!
Post by: @d!_†oX!© on November 07, 2009, 02:40:51 pm
Post by: nid404 on November 07, 2009, 02:41:28 pm
Is this what u want to show
Post by: Ghost Of Highbury on November 07, 2009, 02:41:52 pm
thus unit vector =
Post by: ~~~~shreyapril~~~~ on November 07, 2009, 02:43:35 pm
By the way aadi pls pick up ur land line!!
busy or wat??
Post by: nid404 on November 07, 2009, 02:52:23 pm
=
= 13
thus unit vector ==
that's exactly what I said.......
Post by: Ghost Of Highbury on November 07, 2009, 03:06:11 pm
hey nid..yaar plss help me hear https://studentforums.biz/index.php/topic,4723.45.html
u mean "here"
lol..i hate homophones :P
Post by: nid404 on November 07, 2009, 03:06:40 pm
Post by: @d!_†oX!© on November 07, 2009, 03:07:37 pm
nd nid...dont worry we dont continue these convos for long as long as shrey doesn't comment on anything nd stretch the convo from thn
Post by: sameer210394 on November 07, 2009, 03:12:04 pm
@sameer-if u've understood the question plz help him
fresk i was havin ma dinner, ny ways adi has answered him, n shrey is wanting adi to answer all his doubts so y shall i bother... fheww... :P ;D
Post by: Ghost Of Highbury on November 07, 2009, 03:17:36 pm
@shrey - abbe, jyaada time nahi hai, book khol ke padhna start kar :P
Post by: sameer210394 on November 07, 2009, 03:30:27 pm
chal be...bhau mat kha..he didnt mention dat....u mocked him..so he said he was serious :P
@shrey - abbe, jyaada time nahi hai, book khol ke padhna start kar :P
abbey he did, go few pages bak, imean 1 page...
abbey isme bhau kane jaisa kya hein,
Post by: Ghost Of Highbury on November 07, 2009, 03:44:38 pm
4get it.. :P
Post by: @d!_†oX!© on November 07, 2009, 04:08:51 pm
plsss check IGCSE physics...
Post by: sameer210394 on November 07, 2009, 04:23:37 pm
abbe if some1 mocks u by saying "tujhe itna bhi nahi aata" to it is clear thatthe person is not gonna answer u.
4get it.. :P
abbey he know the ans)) he wilin away tym... LMAO!!
Post by: Ghost Of Highbury on November 07, 2009, 04:24:42 pm
abbey he know the ans)) he wilin away tym... LMAO!!
lol..actually sahi baat hai , if u can answer the lambda and constants ka vector question..ismein kya hai phir?..rofl
Post by: astarmathsandphysics on November 07, 2009, 04:40:23 pm
this is the original doubt i had!!
i tired it but i got ans as 1.3 sec wheas in proving it must be 1.8!!!
help!!
r(spacecraft)=12j+(40i+15j)t=r(nissile)=46i+(ki+30j)(t-0.5)
equating the i components 40t=46+k(t-0.5)
equating the j components 12+15t=30(t-0.5) from this 27=15t so t=1.8
the from the i component equation 72=46+2.3k so k=20
Post by: ~~~~shreyapril~~~~ on November 08, 2009, 12:15:49 pm
this is the original doubt i had!!
i tired it but i got ans as 1.3 sec wheas in proving it must be 1.8!!!
help!!
r(spacecraft)=12j+(40i+15j)t=r(nissile)=46i+(ki+30j)(t-0.5)
equating the i components 40t=46+k(t-0.5)
equating the j components 12+15t=30(t-0.5) from this 27=15t so t=1.8
the from the i component equation 72=46+2.3k so k=20
thanx a star!!!
helped me alot!!
By the way aadi i did not know how to do it!!
i was not willing away my time!!
waise bhi i have got no time to wile away!!! :P :P
Post by: sameer210394 on November 08, 2009, 01:27:46 pm
thanx a star!!!
helped me alot!!
By the way aadi i did not know how to do it!!
i was not willing away my time!!
waise bhi i have got no time to wile away!!! :P :P
han han shrey, rehne de tu to....
Post by: ~~~~shreyapril~~~~ on November 08, 2009, 01:36:46 pm
yaar mera thread spoil mat kar!!
badmein jhagdega!!
pls
Post by: ~~~~shreyapril~~~~ on November 09, 2009, 05:12:42 pm
NE BODY HERE WITH NEW DOUBTS!!
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 02:28:32 pm
pls help in 2009 m/j Q1
paperm posted here
Post by: astarmathsandphysics on November 12, 2009, 02:37:23 pm
Post by: Ghost Of Highbury on November 12, 2009, 02:38:21 pm
i always forget to take unit vector!!
pls help in 2009 m/j Q1
paperm posted here
Q1 isnt anything abt unit vector
Post by: @d!_†oX!© on November 12, 2009, 02:38:47 pm
add. math paPER IS NEARER!!!dude did u like uddenly remember that u must write in CAPS??!!lol...
NE BODY HERE WITH NEW DOUBTS!!
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 02:40:17 pm
m/j p2!!
here is the paper
Post by: Ghost Of Highbury on November 12, 2009, 02:41:40 pm
Post by: .......dA dEviL..... on November 12, 2009, 02:42:24 pm
Post by: astarmathsandphysics on November 12, 2009, 02:43:33 pm
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 02:46:42 pm
it is m/j 04 paper2
http://www.freeexampapers.us/IGCSE/Additional%20Maths/CIE/2004%20May/add%20maths%20qpaper%202%20M-J%202004.pdf
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 02:51:45 pm
-ve ans??
Post by: Ghost Of Highbury on November 12, 2009, 02:53:10 pm
wat does the ms say?
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 02:53:42 pm
Post by: slvri on November 12, 2009, 02:56:29 pm
Post by: Ghost Of Highbury on November 12, 2009, 02:58:47 pm
done something rong
( i – 7j ) + x( 0.6i + 0.8j ) = 4i + k j
i-7j +0.6xi + 0.8xj = 4i + kj
(0.6x + 1)i -7j + 0.8xj = 4i + kj
0.6x + 1 = 4
x = 5
k = -7 + 0.8x = -7 + 4 = -3
Post by: Ghost Of Highbury on November 12, 2009, 03:00:00 pm
hey ppl! hw was ur add math ppr?
paper 1 was awesome!..simply outstanding,,,to my knowledge, i lost only 1 till now...but lets see!..hope the results are good! :D
Post by: slvri on November 12, 2009, 03:01:17 pm
hope ppr 2 goes just as great
so only add math is left?
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 03:01:53 pm
aadi why did you take x and multiplied it with 0.6 an all those rott!??
Post by: Ghost Of Highbury on November 12, 2009, 03:05:42 pm
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 03:07:31 pm
Post by: Ghost Of Highbury on November 12, 2009, 03:13:10 pm
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 03:20:08 pm
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 03:32:15 pm
Q11 (iii) and (iv) m/j 1002 paper 1!!
and this time no error
Post by: Ghost Of Highbury on November 12, 2009, 03:36:53 pm
here
dy.dx = 4x - 8
equate to 0
x = 2
k=> 2
(iv) u can do it urself
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 03:45:10 pm
i knew iii i just had ot confirm
but iv is real problem
Post by: Ghost Of Highbury on November 12, 2009, 04:03:14 pm
dude!..(iv) is a problem!!! kya paka raha hai be
abbe inverse dhoondne mein kya problem hai??
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 04:04:10 pm
yaar
jaldi
mereko dusra kaam hai!!
i have to leave early :(
Post by: Ghost Of Highbury on November 12, 2009, 04:06:37 pm
use x = -b (+-) b^2 - 4ac / 2a
bas! khatam!
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 04:08:20 pm
and just find x!!
Post by: Ghost Of Highbury on November 12, 2009, 04:12:51 pm
y = 2x^2 - 8x + 5 = 2(x-2)^2 -3
solve for x direcftly
y + 3 = 2(x-2)^2
(x-2)^2 = y+3 /2
x-2 =
x =
g-1 (x) = 2 +
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 04:13:49 pm
Post by: vaan on November 12, 2009, 04:16:52 pm
u found perfect square in (i)...
use dat 1 2 find de g-1
(i) =2(X-2)2+1....
let g(x)= y
y=2(x-2)2 +1...
(y-1)/2= (x-2)2...
{(y-1)/2}1/2= (x-2)...
[{(y-1)/2}1/2]+2=x...
hence g-1(x)=[{(x-1)/2}1/2]+2...
NOW PUT K VALUE....K=2...
g-1(2)=9/4
Post by: vaan on November 12, 2009, 04:18:50 pm
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 04:19:57 pm
i know its a complicated way of showin....but im new so not dat much experienced....i guess it must be -3
u found perfect square in (i)...
use dat 1 2 find de g-1
(i) =2(X-2)2+1....
let g(x)= y
y=2(x-2)2 +1...
(y-1)/2= (x-2)2...
{(y-1)/2}1/2= (x-2)...
[{(y-1)/2}1/2]+2=x...
hence g-1(x)=[{(x-1)/2}1/2]+2...
NOW PUT K VALUE....K=2...
g-1(2)=9/4
Post by: Ghost Of Highbury on November 12, 2009, 04:21:19 pm
click on the pi symbol
and type in sqrt(watever u want to type)
like this
@shrey - what guess!, it has to be -3 @vaan - dude, good method, but check ur complete the square thingy its not +1 its -3
Post by: @d!_†oX!© on November 12, 2009, 04:22:43 pm
...
Post by: Ghost Of Highbury on November 12, 2009, 04:26:32 pm
there are many more things with latex
u can use integration, fraction symbols and stuff
Post by: ~~~~shreyapril~~~~ on November 12, 2009, 04:27:03 pm
i amy ban you :P
Post by: .......dA dEviL..... on November 12, 2009, 04:45:47 pm
Post by: vaan on November 12, 2009, 06:48:52 pm
Yo banana head..datz y u made me cl ya..u punk..m so kickin u A** 2mrw...n 1 mo thng da answr iz -3 ...watch wat u doin...n if u gt ne probz..gime a ring..:D:D..
hey b4 u ans i already understood how2 do it...u cant take de cradit...molla....kobutar..aichana ami chi na ja tui aishob nam use korish na....VALO KORA MATHAR VITOR DUKA...
Post by: Saladin on November 12, 2009, 06:59:04 pm
u guys especially Shrey talk a lot on mine....
i dont mind dat much
its just playful.
Post by: Ghost Of Highbury on November 13, 2009, 05:18:05 am
no ms in FEP :(
check xtremepapers, has almost everything
http://www.xtremepapers.net/CIE/index.php?dir=Cambridge%20IGCSE/0606%20-%20Mathematics%20%28Additional%29/
Post by: sanghvi_994 on November 13, 2009, 05:23:47 am
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 05:38:57 am
hoping that p2 is same :D
Post by: neelcullen on November 13, 2009, 05:44:28 am
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 05:46:27 am
check xtremepapers, has almost everythinggreat site dude!!
http://www.xtremepapers.net/CIE/index.php?dir=Cambridge%20IGCSE/0606%20-%20Mathematics%20%28Additional%29/
evethough i knew it :P
Post by: sanghvi_994 on November 13, 2009, 05:48:50 am
paper 2 is gonna be much tougher!!! but hopefully its as good as paper one :) how much time is ur paper in??/
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 05:55:46 am
m/j 2004 p2 Q5!!
asap
Post by: Ghost Of Highbury on November 13, 2009, 06:24:11 am
follow this : use
these become c and d
substitute them to 1/c + 1/d and simplify to get root 5
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 11:32:10 am
great!!
thanx dude!!
i gues you were too late
thanx for it
i liked add. math today..
too lengthy but nice
Post by: sameer210394 on November 13, 2009, 12:01:27 pm
k
great!!
thanx dude!!
i gues you were too late
thanx for it
i liked add. math today..
too lengthy but nice
paper 2 ??? or paper 1???
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 12:05:32 pm
you enjoy dude!!
finished ur exam.....
how did ya manage to finish so early
Post by: Ghost Of Highbury on November 13, 2009, 01:18:15 pm
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 01:41:23 pm
lol, abbe peche mud ke dekh to andhe, he finished 2-4 mins b4..jab hum submit kar rahe the.. :Pdude he had done and left the rrom 10 min before!!
u saw late
u laso finished earlier i was the last one..!!
samjha
By the way good morning..
sapne mien kya dekha :P
Post by: Ghost Of Highbury on November 13, 2009, 01:49:45 pm
i asked reeta ma'am wen i was giving my paper abt him leaving, she said "bas abhi hi gyay, voh 2 min bhi nahi hue"
chod na!...he has finished it now! we have 1 more to go..lol.. :P
Post by: ~~~~shreyapril~~~~ on November 13, 2009, 02:30:16 pm
i think i must not have taken chem for this reason..
if possible y msngr pe aa..!!
Post by: sameer210394 on November 13, 2009, 05:30:26 pm
p2!!
you enjoy dude!!
finished ur exam.....
how did ya manage to finish so early
abbey i finished at 3:00 whereas the exam was supposed 2 get over by 3:05 lolz sirf paanch min
Post by: Ghost Of Highbury on November 13, 2009, 05:43:14 pm
Post by: ~~~~shreyapril~~~~ on November 14, 2009, 06:55:57 am
not at 3:5
at least i think
Post by: sameer210394 on November 14, 2009, 10:00:47 am
dude theexam got over at 3:10
not at 3:5
at least i think
*censored* sake tere ko 5 Min extra mila ???
Post by: ~~~~shreyapril~~~~ on November 14, 2009, 11:11:10 am
fatte yaarr
check the thread all oct/nov 2009 paper discussion!!
i guy finished it so early he had 40 min left for correction