Question

if a tiny marble has a radius of 0.25mm how many marbles can be lined up across the circumference of the earth, distance of 24900 miles?

Answer 1

Answer : The number of marbles lined up across the circumference of the earth can be,
`8.013* 10^(10)` marbles

Explanation :

First we have to calculate the diameter of tiny marble.

`Diameter=2* Radius`

r = radius of marble = 0.25 mm

`Diameter=2* (0.25mm)=0.50mm`

Now we have to calculate the number of marbles can be lined up across the circumference of the earth.

Given:

Circumference of the earth distance =
`24900mile=4.00641* 10^(10)mm`

conversion used:
`1mile=1.609* 10^6mm`

Number of marbles can be lined up =
`(4.00641* 10^(10)mm)/(0.50mm)=8.013* 10^(10)` marbles

Thus, the number of marbles lined up across the circumference of the earth can be,
`8.013* 10^(10)` marbles