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【答案】(1)B(1分)△s(2)w=(2分)d△t(3)在砝码的质量和转动半径一定的情况下，向心力大小与角速度的平方成正比(3分)【解析】(1)实验中保持砝码的质量和转动半径不变，改变其转速，所以采用的是控制变量法，B正确。(2)挡光杆处的线速度大小为=,则角速度大小为u=△s△t△t(3)由图乙知，在砝码的质量和转动半径一定的情况下，向心力大小与角速度的平方成正比。
第四部分写作第一节短文改错I'm here to call on all of us A save food.In ourtocampus,students are often seen wasting food.They eitherorder too much to eat out and throw out the food becauseorof it doesn't taste good.They may forget the famous lineof poetry,"Every grain on the plate come from hardcomeswork"or actually don't get its real meaning.Sohowwhatshould we do to stop this?On the one hand,we shouldorder so much as we can eat and not be too particularlyasparticularabout food.On the other hand,if they cannot finish all thewefood we order,taking the rest away.Saving food istakeeverybody's responsible.Let's start right away!responsibility
