2.A、B兩個(gè)物體在足夠高處分別以v0和3v0的初速度同時(shí)做平拋運(yùn)動(dòng),在初始2s內(nèi),A、B兩個(gè)物體通過(guò)的水平距離之比是__________;兩個(gè)物體的速度增加量之比是__________。
1.在核反應(yīng)方程U+n®X+Sr+2n中,原子核X含有______個(gè)核子;U是天然放射性元素,它的半衰期約為7億年,則在距今大約21億年前,一塊鈾礦石中U的原子數(shù)大約是現(xiàn)在的_____倍。
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六.論述題 (20分)
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五.分析說(shuō)明題 (共30分 , 每小題15分。)
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