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Originally Posted by threewingedfury
A particle is in uniform circular motion about the origin of an x-y coordinate system moving clockwise with a period of 7 seconds. At one instant its position vector is 2i-3j
Find speed and magnitude of the acceleration.
I completely dont understand this one!
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Find the length of the position vector, this is the radius. You are given the period.
Now find the circumfrence of the circle. You now have the distance the particle is travelling over a certain amount of time. So you have the speed.
As for the centripetal acceleration it is given by a=(v^2)/r