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【考范文】Dear[文] fellow studentsW[章]ith the cold and flu season colliding[来] (Rzi) with the COVID. 19 pandemic,[自] how to protect ourselves[知] ismailer of urgency. To combat the flu and other illnesses[嘛] this season, all students had better do as followsTh[答]e single best way to prevent seasonal flu is to get vaccinate[案]d, but good health habits like avoidingp[网]eople who are sick, covering your cough and washing your hands of ten can help stop the spread of germsaddi[文]tionally,[章] it's strongly advised to get enough sleep and reduce stress, which is also of great help.It's high time that we took preventiv[来]e measures to ensure a sound body and a happy lifeStude[自]nt Union
22(1)/(F-[知]mR(2分)(2)[嘛](F-mg)Ram[答]gEn(2分)(3[案])(2分)解析:([网]1)题目中没有说圆[文]弧轨道光滑,故不能[章]用机械能守恒定律计[来]算速度。滑块A运动[自]到圆弧轨道末端时有[知]F-mg=mR,解[嘛]得v=、/(F=m[答]g)R(2)滑块A[案]在水平桌面滑行时,[网]由公式v2=2px[文]1可得m=(F-m[章])RangII(3[来])若A、B碰撞过程[自]中动量守恒,则有m[知]v=2m,v2=2[嘛]ugx2,解得x,[答]=x,所x2
