Question

Let
r = x i + y j + z k
Find each of the following. (Give your answers in terms of r.)

∇ · (|r| r)

Answer 1

I just dont understand |r|r, i didnt think this ment anyting for vectors

Answer 2

|r| it represents the magnitude of vector, and we can multiply scalar with vector

Answer 3

so sqrt(x^2 + y^2 + z^2) is a scalar and i should just write it out?

Answer 4

yeh