[填空题]
The block of mass m slilom1km hutvp/64b lt g vs-2v,pr ,*;wding withoue/dd*g(i.0emf zdc62v4bfmtxmnu6 5 t friction along the looped track shown in Fig. 6–39 is to remain on the track x *m6/2zcm0dt n 46.ddf vebeim(fug5at all times, even at the very top of the loop of radius r.
(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
