posted by Kelly
1.If a particle moves in a plane so that its position is described by the functions x=A*cos(wT) and y=A*sin(wT), the particle is ( w-angular velocity, T-period)
A) moving with constant speed along a circle
B) moving with a varying speed along a circle
Note that x^2 + y^2, the square of distance from the origin, is A^2
Note also the value of the square of the speed, which is [(dx/dt)^2 + (dy/dt)^2] , is A^2 w^2, which is a constant.
What does that tell you about the motion?
The word "centripetal" refers to the force that keeps changung the directkion of motion. The answer to the question is (A).