C3 .3 Suppose the same steady water jet as in Prob. P3. 40 (jet velocity 8 m/s and jet diameter 10 cm) impinges instead on a cup cavity as shown

in Fig. C3. 3. The water is turned 180° and exits, due to friction, at lower velocity, V. =4 m/s. (Looking from the left, the exit jet is a circular annulus of outer radius R and thickness h, flowing toward the viewer.) The cup has a radius of curvature of 25 cm.Find (a) the thickness h of the exit jet and (b) the force F required to hold the cupped object in place. (c) Compare part (b) to Prob. 3.40, where F ~ 500 N, and give a physical explanation as to why F has changed.