The motion of a 1-lb block B in a horizontal plane is defined by the relations r = 6 (1 + cos 2t) and

The motion of a 1-lb block B in a horizontal plane is defined by the relations r = 6 (1 + cos 2πt) and θ = 2πt , where r is expressed in feet, t in seconds, and θ in radians. Determine the radial and transverse components of the force exerted on the block when

(a) t = 0,

(b) t = 0.75 s.

00 0 B A