EGN 3321 Lecture Notes - Lecture 4: Statics, Hodograph
Document Summary
A quick review (l4, 1-18-12), 12. 5 (pp. For key points of the solution see solution (partial), p. 681. One more (final) quick review of rectilinear motion. Concept quiz: if a particle starts from rest and accelerates according to the graph shown, the particle"s velocity at t = 20 s is. C) 0: 100 m/s, 20 m/s, the particle in problem 1 stops moving at t = _______. C) 30 s: 20 s, 40 s. The a-t graph, average speed, and distance traveled for the 0 - 90 s interval. Find slopes of the v-t curve and draw the a-t graph. For 0 t 30 a = dv/dt = 1. 0 m/s . For 30 t 90 a = dv/dt = -0. 5 m/s a-t graph a(m/s ) S0-30 = v dt = (1/2) (30)2 = 450 m. = (1/2) (-0. 5)(90)2 + 45(90) (1/2) (-0. 5)(30)2 45(30) s0-90 = 450 + 900 = 1350 m vavg(0-90) = total distance / time.
