This stadium can hold 100,000, or 1  x  10^5, people. the number of atoms in a grain of iron is about 1  x  10^18. would you need 1  x  10^10  or 1  x  10^13  stadiums to hold the same number of people as the number of atoms in a grain of iron? explain your answer.

1 x 10^13 stadiums

From the question;

1 x 10^5 people can fill 1 stadium

We are given,  1 x 10^18 atoms of iron

We are required to determine the number of stadiums that  1 x 10^18 atoms of iron would occupy.

We are going to assume that a stadium would occupy a number of atoms equivalent to the number of people.

Therefore;

One stadium =  1 x 10^5 atoms

Then, to find the number of stadiums that will be occupied by  1 x 10^18 atoms;

No. of stadiums = Total number of atoms ÷ Atoms in a single stadium

                           =  1 x 10^18 atoms ÷  1 x 10^5 atoms

                          =  1 x 10^13 stadiums

Therefore,  1 x 10^18 atoms of iron would occupy  1 x 10^13 stadiums

d.) circle motion requires a force to give it a centripetal acceleration.