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Homework Statement
So I took my calc 3 exam today and had this question
true or false
magnitude ( v+v) = 2*magnitude( v)
I put true.
Thoughts?
Really? I don't see how this is correct.You got it correct.
If ##\vec v = \langle a,b,c\rangle## what do you get for ##|\vec v|## and ##|2\vec v|##?Really? I don't see how this is correct.
Sorry, of course it's correct.If ##\vec v = \langle a,b,c\rangle## what do you get for ##|\vec v|## and ##|2\vec v|##?
Don't feel to bad about that. My first reaction was the same because I was expecting the question to read u+v since, in my opinion, that would have been a better question. Only after I started my reply did I realize the OP had v+v.Sorry, of course it's correct.
I was having a senile moment when I was imagining the two vectors weren't the same! D'oh!
Don't feel to bad about that. My first reaction was the same because I was expecting the question to read u+v since, in my opinion, that would have been a better question. Only after I started my reply did I realize the OP had v+v.
I obviously need to learn to read twice before posting. Something which you two are obviously better at than me!Did the same thing here.
Now you've lost me!If v happened to be perpendicular to itself, the original statement wouldn't be true.:tongue:
(The zero vector not included, of course.)
What if it's bent?Math humor...
A nonzero vector can't be perpendicular to itself.