Hi

I need help on the following questions:

1)Given and , find the angle between b and c.

This is what i have done:

=60'58'

answers says its 114'50'

2)Given and find the value of t if the angle between the two vectors is 60 degree

P.S

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- Jan 21st 2010, 04:07 PMPaymemoneyMore Vector Questions
Hi

I need help on the following questions:

1)Given and , find the angle between b and c.

This is what i have done:

=60'58'

answers says its 114'50'

2)Given and find the value of t if the angle between the two vectors is 60 degree

P.S - Jan 21st 2010, 04:20 PMadkinsjr
- Jan 21st 2010, 04:26 PMPaymemoney
oops i c now

- Jan 21st 2010, 04:33 PMPaymemoney
could someone answer my second question?

- Jan 21st 2010, 04:34 PMadkinsjr
For the second problem, just start by writing what you know. The main equation you will need is:

The dot product is

So now the main equation becomes:

You need the absolute values:

Substituting into the main equation results in:

Square both sides to obtain:

- Jan 21st 2010, 05:08 PMPaymemoney
ok thanks i'll tried that

- Jan 21st 2010, 05:16 PMPaymemoney
- Jan 21st 2010, 05:51 PMadkinsjr
- Jan 21st 2010, 07:34 PMPaymemoney
that's alright i get it now