2022英语在周报答案

24.【解析】(1)粒子在磁场中做匀速圆周运动,由牛顿第二定律得为B(2分)由几何关系得r=l(2分)联立解得B=m(1分)(2)粒子在磁场中做匀速圆周运动的周期T(1分)粒子在磁场中运动的时间t1=1T(1分)粒子在电场中做类平抛运动,则有E=a(1分)(1分)粒子从P点运动到P点正下方所用的时间t=t1+(1分)联立解得t=x2u gE(2分)

、写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Last Saturday, my classmates and I went to the Chinese Academy of Sciences, what was aprecious chance to get closely to science. The moment whan we arrived there, we were warmlygreeted by an expert stood at the entrance. To have A better understanding of daily basic science,standingwe first attend a professional lecture on the theme of life and Water. The highlight of the visitattendedvere the hands-on experience in the science lab Under the guidances of the expert, we gotinvolved in a medical experiment with great enthusiasm Through the meaningful activity we allagree science plays an important role in our life. We are determining to study hard to understanddeterminedthem

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