biomechanics 1.two balls have the same size but with different weights.when they are dropped at the same time and from the same height, which one reaches the ground first?suppose are resistance can be neglected.a.the heavier one.b.the lighter one. c.the same. 2.two equally heavy balls have different sizes.when they are dropped at the same time and from the same height,which one reaches the ground first?air resistance needs to be considered.a.the bigger one.b.the smaller one.c.the same. 3.a baseball is thrown upward with initial velocity v,when it reaches its maximum height,its velocity is .a.v/2.b.v/4.c.0 4.similar to the above question,when the ball reaches its maximum height,its acceleration is a.9.8 m/s2 upward b.9.8 m/s2 downward c.0 5.invertical jumping,suppose we are interested in the maximun height height H reached by the center of mass(COM) after takeoff.which of the following is not related to H? a.body extension after takeoff b.com height at takeoff c.com velocity at takeoff 6.from question 5 and suppose g is the gravitational accelration.if the com height at takeoff is h and com velocity at takeoff is v,then the maximum height reached by com after takeoff is a.h+v2/2g b.h-v2/2g c.h+v2/g 7.in gymnastic vaulting,a gymnast pushes off from the horse(or vaulting talble)to enter th post-flight phase. if air resistance in neglected,which of the followings is not conserved in this phase.a.total linear momentum of the body b.total angular momentum of the body c.total kinetic energy of the body 8.a net force of 10 newtons(n)accelerates a shot-put(铅球)at 5 m/s2.what net force would be required to accelerate the same object at 1 m/s2? a.1n b.2n c.3n 9.a gymnast is performing a pike somersault with the body shape shown below. the head is at point o,the waist is at point c,and the feet are at point a. point b does not belong to any body segment,and is located between link co and link ca.which point best represents the com position? a.a b.b c.c 10. in ruunning high jumps,can a jumper clear th height which is even above the maximum height the body com can achieve a.yes b.no c.impossible to know 11.in figure skating,a skater pull the arms closer to the trunk to increase the spin rate.which of the following is not directly related to this phenomenon? a.conservation of angular momentum b.newton's third law c.reducing the moment of inertia about the spin axis 12.two acrobats a(50 kg)and b(40 kg)are performing together but unforrunately collide with each other in the air.if a moves at 1.5 m/s to the east and b moves at 3 m/s to the west before collision,determine their common velocity immediately after they collide and become coupled together after the collision a.0.5 m/s th the east b.0.5 m/s to the west c.0 计算题 1.a human body is modeled with 3 parts as arms(ar ,with mass 5kg),head-trunk (ht,with mass 30kg),and lower body(lb,mass 15kg).from video analysis of a jumping motion the acceleration of each part is known.that is,ar is 0.5 m/s2, ht is 1 m/s2,and lb is 2 m/s2(all upward). a.caculate the ground reaction force(magnitude and direction) b.caculate the force acting between the ht and lb(only magnitude) 2.a person pushes a shot-put(mass m)with constant force f along the direction shown below. the shot-put starts from rest at the origin o,the release height of the shot-put com is h.the gravitaitonal acceleration is g. a.caculate the velocity magnitude of the shop-put at release.express your answer in terms of f,m,g,and h b.suppose the release velocity is v(in the direction of the arrow in the figure),caculate the time when the com passes through point 0,express your answer interms of v,g,and h 运动生理 1.试说明运动後氧过耗量(excess post-exercise oxygen consumption,epoc)的构成因素 有哪些?epoc和养债(oxygen debt)有何不同? 2.在非最大运动过程中,运动强度(如:跑步速度)不变,但为何会有所谓心跳率随运动时间 的增长而慢慢增加的心血管漂移现象(cardiovascular drift)?是说明其形成的原因有哪 些. 3.试简要说明糖质新生(glyconeogenesis)的过程及其在身体何处进行?新生成之葡萄糖 (glucose)之去向(命运)为何?糖质新生在运动过程所扮演的角色为何? 4.杰恩是一位两百公尺短跑的选手,在一次的比赛中,他在热身过程中觉得身体状况不错, 但因为杰恩求好心切,希望能在这次比赛中创佳绩,因此,又在赛前约30分钟时,吃了因根 巧克力棒,还喝了一瓶高糖饮料,结果,来到比赛时刻,他突然觉得全身无力,裁判枪响後, 他起跑的速度远不如预期,他知道他将输掉这场比赛,但他不知为何会发生这样的状况, 是从生理学的角度书明杰恩的赛前出了甚麽问题,针对此问题,您对杰恩的建议为何? 5.是列举5种因过度训练(over training)後所可能表现出来的生理症状? -- ncyu_phyedu@ptt,phyedu_99n@ncyu,TFHS_57__326@ofo,abnormal@cgu face book http://www.facebook.com/home.php?ref=home#/friends/?filter=afp&ref=tn my space http://www.myspace.com/468176328 pchome --

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