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Which of the following statements are/is true ? Explain why the false one is false


A) If u= (u1,u2) with u(i) not equal to 0 for some 1< i < 2 ( both equal to i ) , then the unit vector in the direction of u is 1/ square root of u(1) squared + u(2) squared * (U(1), u(2)).


B) If u= (1,2,3) find the unit vector in the direction of u.




Which of this is not true?

a.\\(i \times i=j \times j=k \times k=0\\)

b.\\(\alpha \times \beta = \beta \times \alpha \\)

c.\\(\alpha \times \beta =- \beta \times \alpha \\)

d.\\(\alpha \times \beta \neq \beta \times \alpha \\)


Which of this is not true?

a.i*i = j*j = k*k =0

b.α*β = β*α

c.α*β = -β*α

d.α*β = n β*α
b) Find the cylindrical coordinates of the points where the Cartesian coordinates are (2)

i) (6,6,8)

ii) ( SQRT(2),1,1)
a) Express the following surfaces in spherical coordinates

i) xz = 3

ii)x^2+y^2-z^2=1
Express the following surfaces in spherical coordinates



i) xz = 3

ii) x^2+y^2-z^2=1
For vectors U, V, W, show that U.V = V.U and (U + V).W = (U.W) + (V.W)
Find the unit U(A) of a vector A = -20I + 36J. Given a vector A, U(A) is defined as A/|A|
Suppose u and v are non zero factors in 3-space, where u=(u1,u2,u3) and v=(v1,v2,v3).


Prove that u * v is perpendicular to both u and v by making use of the det product.


Please assist.
Find the angle between the vectors

α

Ì



=

2

i

+

2

j



k

αÌ…=2i+2j−k and

\

e

t

a

=

6

i



3

j

+

2

k

\eta=6i−3j+2k.
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