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15.(10分)([文]1)②(2分)(2[章])5.722(2分[来])1.40(2分)[自]2g4,24)(2[知]分)1(3(4)大[嘛]于(2分)【考查点[答]】本题考查验证机械[案]能守恒的实验。【解[网]析】(1)根据机械[文]能守恒定律得mgh[章]=)m,2-)mm[来],即动=了，-'，可道过步聚④直接[自]测量物理量么，通过[知]步骤21①③⑥间接[嘛]测量物理量1、2，[答]步骤⑤为实验过程中[案]的规范操作，不需要[网]测量的物理量为m,[文]则不必要的实验步骤[章]是②。(2)由题图[来]2可知，螺旋测微器[自]固定刻度读数为5.[知]5mm,可动刻度读[嘛]数为22.2×0.[答]01mm=0.22[案]2mm,则d=5.[网]5mm+0.222[文]mm=5.722m[章]m,由极短时间内的[来]平均速度等于小钢球[自]通过光电门的瞬时速[知]度，可知v,=,解[嘛]得e,≈1.40s[答]。△t(3)A点速[案]度1=B点速度是根[网]据机被能守何定律得[文]h=分，弓m,联立[章]解得hdd…21d[来],112g4,24[自],)。（4)由于断[知]电后电磁铁的磁性未[嘛]立即消失、空气阻力[答]不可忽略，都可对小[案]钢球产生阻力做功，[网]使小钢球的动能损耗[文]，导致△E。大于△[章]E。
四、书面表达One[来] possible version:T[自]he Unforgett[知]able Voluntary[嘛] LabourLas[答]t Saturday,[案]my classmate[网]s and I went to NanshanCo[文]mmunity to take part in a voluntary[章] labour organized[来] byour school.We[自] got there at 9:00 a.m.Divid[知]ed into three groups,we[嘛] began to work.Each[答] group had its own tasks.Gro[案]upOne searched for old furniture[网] which was abandoned[文] in thecorrid[章]or and dealt with it.Group Two picked up litter andcleane[来]dpublicar[自]eas to.create[知] amorecomf[嘛]ortableen[答]vironment[案].My group was responsib[网]le for wiping all theequipm[文]ent in the community[章].I devoted myself to my task,just[来] like everyone else did.At about half past eleven we finished working andreturn[自]ed to school.Th[知]ough feeling tired,we were fulfilled[嘛]and happy.It was a meaningfu[答]l day for us.
