1、專業好文檔高中物理基本方法探究講義2運動學1. 線段ab長s，分成n等分，一質點由a靜止出發以加速度a向b作分段勻加速度直線運動，當質點到達每一等分的末端時，它的加速度增加a/n ，求質點運動到b點時的速度。 如果質點的加速度隨位移是連續變化的，加速度和位移的關系滿足ax=a+ax/s，其中ax為物體從a出發經過x位移時的加速度，則質點到達b點時的速度為多大。2. 老鼠離開洞穴沿直線前進，它的速度與到洞穴的距離成反比，當它行進到離洞穴距離為d1的甲處時速度為v1，求：（1）老鼠行進到離洞穴距離為d2的乙處時速度多大？（2）從甲處到乙處要用去多少時間靜力學1. 如圖，用兩根長度相等的細線系住現將

2、質量相等的小球a、b，若在a球上加水平向左的外力3 f，在b球上加水平向右的外力f，則平衡后的狀態為： 2.兩個相同的小球a和b，質量均為m，用長度相同的兩根細線把a、b兩球懸掛在水平天花板上的同一點o，并用長度相同的細線連接a、b兩小球，然后，用一水平方向的力f作用在小球a上，此時三根細線均處于直線狀態，且ob細線恰好處于豎直方向，如圖所示。如果不考慮小球的大小，兩小球均處于靜止狀態，則（1）ob繩對小球的拉力為多大?（2）oa繩對小球的拉力為多大？（3）作用力f為多大？winger tuivasa-sheck, who scored two tries in the kiwis 20-18

3、 semi-final win over england, has been passed fit after a lower-leg injury, while slater has been named at full-back but is still recovering from a knee injury aggravated against usa.both sides boast 100% records heading into the encounter but australia have not conceded a try since josh charnleys e

4、ffort in their first pool match against england on the opening day.aussie winger jarryd hayne is the competitions top try scorer with nine, closely followed by tuivasa-sheck with eight.but it is recently named rugby league international federation player of the year sonny bill williams who has attra

5、cted the most interest in the tournament so far.the kiwi - with a tournament high 17 offloads - has the chance of becoming the first player to win the world cup in both rugby league and rugby union after triumphing with the all blacks in 2011.id give every award back in a heartbeat just to get acros

6、s the line this weekend, said williams.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at t

7、he match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel plati

8、ni, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska. baumgartner the disappoin

9、ting news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule

10、attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and

11、into the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.they blew it in 200

12、8 when they got caught cold in the final and they will not make the same mistake against the kiwis in manchester.five years ago they cruised through to the final and so far history has repeated itself here - the last try they conceded was scored by englands josh charnley in the opening game of the t

13、ournament.that could be classed as a weakness, a team under-cooked - but i have been impressed by the kangaroos focus in their games since then.they have been concentrating on the sort of stuff that wins you tough, even contests - strong defence, especially on their own goal-line, completing sets an

14、d a good kick-chase. theyve been great at all the unglamorous stuff that often goes unnoticed in the stands but not by your team-mates.it is as though their entire tournament has been preparation for the final.in johnathan thurston, cooper cronk, cameron smith and either billy slater or greg inglis at full-back they have a spine that is unmatched in rugby league. they have played in so many high-pressure games - a priceless asset going into saturday.the kiwis are a lot less experience