2022届智慧上进 名校学术联盟考前冲刺·精品预测卷(二)2语文答案

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第二节书面表达One possible version:Dear Kerry,I am really sorry but I have no choice but to stop our online language learning for a while.Words fail me to convey my deep regret.Since we knew each other,you have made much progress in Chinese,so have I in English.But our College Entrance Examination is coming.Faced with the significant challenge,I willdevote myself to my study and have no time to surf the Internet.I promise I'll spare no effort tohelp with your Chinese learning after the exam.I would be grateful if you could understand andforgive me.Looking forward to studying with you online soon.Yours sincerely,Li Hua

13.【解析】(1)设金属棒运动到倾斜导轨底端时的速度为υ,根据机械能守恒定律得mgh=omo(1分金属棒切割磁感线产生的电动势E=BLv(1分)回路中的电流ⅠER+r1分金属棒所受安培力F=BIL分)金属棒的加速度大小a=F联立解得a=5m/s2(1分(2)金属棒从倾斜导轨底端到滑离水平导轨的过程中,回路中磁通量的变化量△=BLx回路中的平均电动势E=4①(1分)回路中的平均电流Ⅰ=ER+r(1分)对金属棒应用动量定理得一BⅠL△t=m-mvbo(2分)可得v=2.5m/s该过程中回路产生的总焦耳热Q=mv-mv2解得Q=0.975J(1分)