12 M Go In Fig. 11.13, a solid brass ball of mass 0.280 g will roll smoothly along a loop-the- loop track when released from rest along the straight section. The circular loop has radius R 14.0 cm, and the ball has radius r R. (a) What is h if the ball is on the verge of leav- ing the track when it reaches the top of the loop? If the ball is released at height h = 6.00R, what are the (b) magnitude and (c) direction of the horizontal force component acting on the ball at point Q? = Figure 11.12 Problem 11. h R e Figure 11.13 Problem 12