早教吧 育儿知识 作业答案 考试题库 百科 知识分享

英文计算题Ifonemicrometeorite(aspherewithadiameterof2.410^(-6)m)struckeachsquaremeteroftheMooneachsecond,howmanyyearswouldittaketocovertheMoontoadepthof1.0(Hint:Consideracubicbox,1.0monaside,ontheMoon,

题目详情
英文计算题
If one micrometeorite (a sphere with a diameter of 2.4 10^(-6) m) struck each square meter of the Moon each second,how many years would it take to cover the Moon to a depth of 1.0 (Hint:Consider a cubic box,1.0 m on a side,on the Moon,and find how long it would take to fill the box.)
▼优质解答
答案和解析
如果一颗小殒石(直径为2.4 10^(-6) m的小球)撞击月球的每一平方米每一秒,多少年它会覆盖月球一米深?(提示:考虑月球上一个正方体盒子,边长一米,找出多少时间,它能装满这个盒子)
殒石体积:球体体积:4/3*圆周率*半径的立方
v=(4/3)*pai*(1.2*10^(-6))^3
再用1立方米处以这个体积,然后再把秒换算成年,不同我再算了吧?