Serway & Jewett — Angular Momentum: Problem 13

A particle of mass \( m \) moves in a circle of radius \( R \) at a constant speed \( v \) as shown in Figure P11.13. Time \( t = 0 \) is defined as when the particle is at point \( Q \). Determine the angular momentum of the particle about the axis perpendicular to the page through point \( P \) as a function of time.