质量为m1和m2的两个物体之间的引力F为
F=G*m1*m2/r^2
这里G为引力常量（6.672*10^-10N*m^2/kg^2）m1和m2是单位为千克的物体质量，r是两个物体之间的距离。编写一个函数计算给定质量和相互距离的两个物体的引力。通过计算在地球38000km处的轨道上运行的1000kg的人造卫星和地球之间的引力来测试所编程序。（地球的质量为5.98*10^24kg）(The gravitational F between the two objects of mass M1 and M2 is
F=G*m1*m2/r^2
Here G is gravitational constant (6.672*10^-10N*m^2/kg^2) M1 and M2 is the mass of a unit kilogram, and R is the distance between two objects. Write a function to compute the gravitational attraction of two objects of given mass and distance. Test the program by calculating the gravitational force between the 1000kg satellite and the earth running on the orbit at the earth's 38000km. (the mass of the earth is 5.98*10^24kg))