Chapter 13, Problem 13.20P

A particle of mass m moves along a straight line with constant velocity ${\stackrel{\to }{v}}_0$ in the x direction, a distance b from the x axis (Fig. P13.10). (a) Does the particle possess any angular momentum about the origin? (b) Explain why the amount of its angular momentum should change or should stay constant. (c) Show that Kepler’s second law is satisfied by showing that the two shaded triangles in the figure have the same area when .

Figure P13.10