DOT PRODUCT

If the vectors 2i^ - 3j^ +3k^ and 3i^+xj^+2k^ are orthogonal (at right angles) then x=

• 2

• 4

• -2

• 1

The work done in moving an object along a vector d = 5i+4j-6k and F = 3i+2j-4k is

• 47

• 45

• 50

• 37

u is a vector of magnitude 2 and v is a vector of magnitude 3, and the angle between them is 45⁰. What is u . v

• 6.2

• 4.2

• 5.2

a = 3i -j , b= 2i+j+4k. What is a . b ?

• 3

• -2

• 5

The Scalar product of two perpendicular vectors is

• 0

• 1

• 2