- #1
Kawakaze
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Homework Statement
I already made a start to this question, the position vectors below are worked out in the first part of it, I am 99% sure they are correct so, on to the bit I am stuck on. :)
A player stands with his feet at the point O and serves the ball from a point Y at
a height of 2.4000m vertically above O. Assume that the ball then travels in a
straight line directly over the net at the midpoint A, which is at a height of
0.9144 m, before bouncing at the point X.
diagram here = https://www.physicsforums.com/attachment.php?attachmentid=32722&d=1299067106
find the dot product of the following position vectors, OX & YX, hence find the angle between them
a=OX=[19.2038i, 6.6475j, 0k]
b=YX=[19.2038i, 6.6475j, -2.4k]
find the cross product of the following position vectors, OY & YX, hence find the area of the triangle they form
a=OY=[0i, 0j, 2.4k]
b=YX=[19.2038i, 6.6475j, -2.4k]
Homework Equations
a(dot)b = |a||b|cos[tex]\theta[/tex]
a x b = absin[tex]\theta[/tex]
The Attempt at a Solution
Not sure how to work this with vectors, I've come across vectors before and the dot and cross product before, but never the two together.
Some hints would be great. :)
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