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MATH AS QUESTIONS>>>

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astarmathsandphysics:
The points A and  B have position vectors a and b respectively, realative to an origin O. The vectors a and b are given by:
a= 2i-2j+k
b= 6i-2j+3k

i] obtain the value of a.b and hence find angle AOB, correct to the nearest degree.


Vector c has magnitude 12units and is such that c=pa, where p is a constant.
Vector d has magnitude 14 units and is such that d=qb, where q is a constant.

ii] Find the values of p and q
iii] Find the magnitude of d-c
i)a.b=2*6+-2*-2+1*3=11


p=|c|/|a|=12/3=4 q=|d|/|b|=14/7=2

Eamyzz:

--- Quote from: astarmathsandphysics on October 15, 2009, 08:53:12 am ---The points A and  B have position vectors a and b respectively, realative to an origin O. The vectors a and b are given by:
a= 2i-2j+k
b= 6i-2j+3k

i] obtain the value of a.b and hence find angle AOB, correct to the nearest degree.


Vector c has magnitude 12units and is such that c=pa, where p is a constant.
Vector d has magnitude 14 units and is such that d=qb, where q is a constant.

ii] Find the values of p and q
iii] Find the magnitude of d-c
i)a.b=2*6+-2*-2+1*3=11


p=|c|/|a|=12/3=4 q=|d|/|b|=14/7=2

--- End quote ---



Thank you  vry much

Eamyzz:
do u have any tricky question any tip u wanna give b4 ma exam mr. paul =)

astarmathsandphysics:
Get there early. Be at peace. Maybe read an exam paper but probably not answer any questions

slvri:

--- Quote from: Eamyzz on October 15, 2009, 07:57:51 am ---yes wat abt u??

--- End quote ---
nope not me.......im giving AS and A2 math in june 2010

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