AEM 264 - DYNAMICS FINAL EXAM QUESTIONS

In dynamics, a particle is assumed to have: A) both translation and rotational motions B) only a mass C) a mass but the size and shape cannot be neglected D) no mass or size or shape, it is just a point - Answer- B) only a mass The average speed is defined as __________. A) Dr/Dt B) Ds/Dt C) sT/Dt D) None of the above. - Answer- C) sT/Dt (total distance/change in time) A particle moves along a horizontal path with its velocity varying with time as listed below. The average acceleration of the particle is _________. At t=2s the particle is moving 3 m/s to the right, at t=7s the particle is moving 5 m/s to the left. A) 0.4 m/s2 to the right B) 0.4 m/s2 to the left C)1.6 m/s2® to the right D)1.6 m/s2 to the left - Answer- D) 1.6 m/s2 to the left. (-5-3)/(7-2) = -8/5 A particle has an initial velocity of 30 ft/s to the left. If it then passes through the same location 5 seconds later with a velocity of 50 ft/s to the right, the average velocity of the particle during the 5 s time interval is _______. A) 10 ft/s to the right B) 40 ft/s to the right C) 16 m/s to the right D) 0 ft/s - Answer- D) 0 ft/ A particle has an initial velocity of 3 ft/s to the left at s0 = 0 ft. Determine its position when t = 3 s if the acceleration is 2 ft/s2 to the right. A) 0.0 ft B) 6.0 ft to the left C)18.0 ft to the right D)9.0 ft to the right - Answer- A) 0.0 ft