Find the magnitude of u if u=5i+6j using the dot product.

Question

aaronandyson · Answer

Magnitude = $$\sqrt{(5)^2 + (6)^2}$$

biologicalscience · Answer

I wish a further explanation is provided

rsadhvika · Answer

This is such a neat relationship 
$$\large \|u\|^2=u\cdot u$$

rsadhvika · Answer

Do you know how to find the dot product between two vectors ?

biologicalscience · Answer

no

biologicalscience · Answer

what are vectors?

rsadhvika · Answer

You aren't planning to learn entire math in a single day haha

rsadhvika · Answer

You aren't supposed to touch "dot product" before knowing what a vector is

biologicalscience · Answer

I did not touch it
did you touch it?

jtug6 · Answer

yeah but dot products are a very simple concept. as are vectors. lol.

rsadhvika · Answer

They are simple and very useful, but one still need to spend time to study them

biologicalscience · Answer

so show me how simple it is

biologicalscience · Answer

vector quantity has both a magnitude (the “how much” or “how big” part) and a direction in space

rsadhvika · Answer

You must tell others what you know already before asking them to teach you something...

biologicalscience · Answer

I know nothing about vector

rsadhvika · Answer

I'd love to share what I know about vectors if you asked specific questions.

jtug6 · Answer

i shall draw one. sec.

biologicalscience · Answer

WHAT ARE VECTORS? is that specific enough?

jtug6 · Answer

|dw:1466054525750:dw|