Help with vectors......
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Help with vectors......

[From: ] [author: ] [Date: 12-09-28] [Hit: ]
there is just need to remember some basic vector properties, and some common sense.as we know, that there are 3 vectors in space.x, y and z.......
Why does a force pointing in the y direction at a 60 degree angle and a 90 degree angle in the z direction equal cos(30)?

I'm thinking it's just 90-60, but what is the principal?

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look man, the answer is so simple.
there is just need to remember some basic vector properties, and some common sense.
as we know, that there are 3 vectors in space.
x, y and z.
and all three are are perpendicular to each other. which means, they all have 90 degree angle with each other.
now to the question,
as our given vector is already perp to z-axis (90 degree with z), and have a 60 degree with y-axis.
this can certainly proves that it makes a 30 degree angle with x-axis.
and as we know, that x-coordinate of any vector is taken as cos(|).

hence, its cos 30 .


Hope this helps... ;)
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