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Homework Statement
A particle moves in a plane described by the position vector r (t)= ( 2bsin( wt ))i + ( bcos( wt ) )j
where b and w are some constants. The angle between its velocity and acceleration vectors at time t=(π/2w)
a) is approximately 27 degree .
b) is exactly 45 degree .
c) is approximately 63 degree .
d) is exactly 90 degree .
e) cannot be determined since b and w are not specified.
Homework Equations
differentiation
The Attempt at a Solution
v(t) = (2bw(cos(wt)))i + (-bw(sin(wt))j
a(t) = (-2bww(sin(wt)))i + (-bww(cos(wt)))j
After that, how do i find the angles?