[填空题]
The block of mass m sliding wmp+ j8j3in(y rq0+0rn3w wvv bqw3u,jithout friction along the looped .wy s7pvix(bbq jy2q8m* 41eltrack shown in Fig. 6–39 is to remain on the track at all times, even at the very top of the loop of radius r.mq84v.1lp w*y2e yb(b qxjis 7 (a) In terms of the given quantities, determine the minimum release height h (as in Problem 40). Next, if the actual release height is 2h, calculate r
(b) the normal force exerted by the track at the bottom of the loop, mg
(c) the normal force exerted by the track at the top of the loop, mg
(d) the normal force exerted by the track after the block exits the loop onto the flat section. mg
