Grade 11 physics.anybody can help me~I will appreciate it
题目
Grade 11 physics.anybody can help me~I will appreciate it
5.Atoms have diameters of about 1 x 10^-10 m.Red blood cells have diamaters of about 1 x 10^-5 m.How many atoms could lie side by side across a red blood cell?
答案
10^5
原子直径1x10^-10 m,红血球直径 10^-5m.一个红血球上横排能放多少个原子?
10^-5 / 10^-10 = 10^5
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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