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

Question

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.)

Answer 1

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?