英语周报八年级2021-2022第33答案

答案】BCD解析】设PQ进磁场时的速度为,则mgm30°=2P,解得=m,A项错误;设金属棒开始释BLm'gR'放的位置离ab的距离为x,则x26BE,设MN从释放到进磁场所用时间为t,则=2mB根据题意知,PQ穿过磁场所用的时间也为gsin 30oB2B2E,B项正确;设ab,c间的距离为,则==2,则金属棒PQ通过磁场过程中,通过B0截面的电荷量4=B=m,C项正确;根据题意可知,PQ、MN均匀速通过磁场,PQ、MN上产生的焦耳热相等,设PQ上产生的焦耳热为Q,则2Q=2mgm30,解得Q1=B,D项正确。

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

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