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, $8.013\times 10^{10}$ marbles

Explanation :

First we have to calculate the diameter of tiny marble.

$Diameter=2\times Radius$

r = radius of marble = 0.25 mm

$Diameter=2\times (0.25mm)=0.50mm$

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 = $24900mile=4.00641\times 10^{10}mm$

conversion used: $1mile=1.609\times 10^6mm$

Number of marbles can be lined up = $\frac{4.00641\times 10^{10}mm}{0.50mm}=8.013\times 10^{10}$ marbles

Thus, the number of marbles lined up across the circumference of the earth can be, $8.013\times 10^{10}$ marbles