- #1

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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?

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- Thread starter Mdhiggenz
- Start date

- #1

- 327

- 1

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?

- #2

- 9,559

- 773

You got it correct. Were you just guessing?

- #3

- 327

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- #4

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Really? I don't see how this is correct.You got it correct.

- #5

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Really? I don't see how this is correct.

If ##\vec v = \langle a,b,c\rangle## what do you get for ##|\vec v|## and ##|2\vec v|##?

- #6

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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|##?

I was having a senile moment when I was imagining the two vectors weren't the same! D'oh!

- #7

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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.

- #8

- #9

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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.

Did the same thing here.

I obviously need to learn to read twice before posting. Something which you two are obviously better at than me!

- #10

Mark44

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(The zero vector not included, of course.)

- #11

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(The zero vector not included, of course.)

Now you've lost me!

- #12

Mark44

Mentor

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Math humor...

A nonzero vector can't be perpendicular to itself.

A nonzero vector can't be perpendicular to itself.

- #13

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Math humor...

A nonzero vector can't be perpendicular to itself.

What if it's bent?

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