Posted by **marley** on Friday, June 10, 2011 at 1:27am.

given vectors ,

Vector a= 2i + 3j, then the angle between vector a and y axis is?

Plz solve

- science(physics) -
**drwls**, Friday, June 10, 2011 at 2:26am
cosine theta = (a*i)/|a|

|a| is the magnitude of the a vector,

which is sqrt13 = 3.6056

a*1 is the dot product of a and the i vector, which is 2.

Therefore cos theta = 2/3.6056 = 0.5547

theta = 56.3 degrees

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