Prévia do material em texto
(a) W=265J e (b) Wg=-265J e (c) Wt=0J (a) 4,25x10 6 J, (b) 3,48x10 6 J e (c) Zero! (a) -1750J e (b) não. (a) (i) 9,0J e (ii) -9,0J; (b)(i) 0,0 J, (ii) - 9,0J (iii) 0,0 J e (c) zero! -150J a(i) 0,0J a(ii)0,0J (b) -25,1J 65mi/h=29,1m/s. (a) 3,18x10 5 J e (b) f=K/4 e (c) 46mi/h (a) 30,3m/s e (b) 46,8m (a) 9D e (b) D/3 (a) 4,48m/s e (b)3,61m/s 2,97m/s 100m/s (a) 3,2x10 11 J/s, (b) 1,1k(J/s) e (c) 800km 2 3,9x10 13 P 157J/s 1hp=746W�745J/s ou ~1hp Pméd=2,984x10 4 W e 28pessas. Eméd=5,4x10 9 J� Pméd=7,2x10 5 J 0,20W e 7,0x10 5 W (a) 532J, (b) -315J, (c) 0,0J (d) 53,3N, (e) 15,0J e (f) 1,2m/s (a) 0,15N, (b) 9,4N (c) 0,44J 0,6m, (b) 1,5m/s Resp do Ex# 6.82: 5,8J e 2,9m/s.