Question

Can someone please help!! (question is attached)

Answer 1

Remember that the magnitude \(|\vec{a}|\) and dot product \(\vec{a}\cdot\vec{b}\) both operate on *vector(s)* to yield a *scalar*.

Answer 2

also just to double check, you cant multiply a vector and a scalar together right

Answer 3

so would first one be valid

Answer 4

im thinking its valid, valid,invalid, valid

Answer 5

am i right?

Answer 6

@oldrin.bataku

Answer 7

The last is valid? Are you sure? It's a dot product between a scalar and vector.

Answer 8

oh no yr right its invalid

Answer 9

thank you!:)