※ 引述《Xuite (□■□■□■□■)》之铭言： : 星期五没有去上李奎毅老师的物理课, : 刚刚看学校信箱才发现说星期一要交作业, : 有没有人也有修的可以告诉我是什麽作业！ : 拜托>"< 1.The position versus time for a certain particle moving along the x axis is shown in figure P2.1. Find the average velocity in the following time inter- vals.(a)0 to 2s (b)0 to 4s (c)2s to 4s (d)4s to 7s (e)0 to 8s /\ / \___ 图约为 / \ \ \/ 6.The position of a particle moving along the x axis varies in time accord- ing to the expression x = 3*t^2,where x is in meters and t is in secomds. Evalute its position (a)at t= 3s (b)at 3s+Δt (c)Evaluate the limit of Δx/Δt as Δt approaches zero to find the velocity at t = 3s. 10.a 50.0-g super ball travelling at 25.0m/s bounces off a brick wall and reb- ounds at 22.0m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.5ms,what is the magmitude of the average acceler- ation of the ball during this time interval? Note:1ms=10^-3s 12.A velocity-time graph for an object moving along the x axis is shown in Figure P2.12 .(a)Plot a graph of the acceleration versus time.(b)Determine the average acceleration of the object in the time intervals t=5s to t=15s and t=0 to t=20s. _____ 图约为 / / _____/ 16.Draw motion diagrams for (a) an object moving to the right at constant speed ,(b)an object moving to the right and speeding up at a constant rate,(c)an object moving to the right and slowing down at a constant rate,(d)an object moving to the left and speeding up at a constant rate,(e)an object moving to the left and slowing down at a constant rate. (f)How would your drawings change if the changes in speed were not uniform;that is,if the speed were not changingat a constant rate? 18.A truck covers 40.0m in 8.50s while smoothly slowing doewn to a final speed of 2.80m/s.(a)Find its original speed. (b)Find its acceleration. 24.A particle moves along the x axis. Its position is given by the equation x = 2 + 3*t - 4*t^2,with x in meters and t in seconds. Determine (a)its posi- tion when it changes direction and (b)its velocity when it returns to the position it had at t=0. 25.An electron in a cathode-ray tube accelerates from a speed of 2.00*10^4m/s to 6.00*10^6m/s over 1.50cm. (a)In what interval does the electron travel this 1.50cm? (b)What is its acceleration? 39.A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0m/s,and the distance from the limb to the level of the saddle is 3.00m.(a)What must the horizontal distance between the saddle and the limb be when the ranch hand makes his move?(b)For what time interval is he in the air? 40.A student drives a moped along a straight road as described by the velocity-versus-time graph in Figure P2.40. Sketch this graph in the middle of a sheet of graph paper.(a)Directly above your graph,skectch a graph of the position versus time,aligning the time coordinates of the two graphs.(b)Sketch a graph of the acceleration versus time directly below the Vx-T graph,again aligning the time coordinates. On each graph,show the numerical values of x and Ax for all points of inflection. (c)What is the acceleration at t = 6s? (d)Find the position (relative to the starting point) at t = 6s. (e)What is the moped's final position at t = 9s? ___ / \ / \ 图约为 / \ \ \ \ 题目基本上都会一样，请自行查对题号。 没有下次，各位该上的正课和演算课是要到阿，会有点名跟小考。 -- ◤---※~◥ 东方Project 第10作 ◤◢◣◣◥ 豊かさと稔りの象徴 ▉ ● ● Aki Minoriko 东‧方‧风‧神‧录 ◆◣ ◢◆ 秋 穣子 Mountain of Faith. /▉▁▏\ 能力：豊穣を司る程度の能力 /▂▂\ ψfishhzy123 --

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