Question

the magnitude torque produced by the centripetal force fc vector in circle of radius r vector is given by:a)r vector.fc vector b)fc vector. r vector c)zero d)r vector . f vector​

Answer 1

Since we are assuming circular motion, let r(t) = R·ur, where R is a constant (the radius of the circle) and ur is the unit vector pointing from the origin to the point mass. The direction of ur is described by θ, the angle between the x-axis and the unit vector, measured counterclockwise from the x-axis.