Rope Around The Earth

Divide again by pi to get the earth s radius 6 370km.

Rope around the earth. The rope around the earth puzzle. From the diagram it s pretty clear it s one foot. Imagine there s a rope around the equator of an earth sized sphere making it around 25 000 miles long. Now imagine lifting off this very long rope don t ask me how cutting it somewhere so as to stitch into it exactly one meter of extra rope.

As a circle of radius r has a circumference of 2 π r regardless of the value of c. If you put 1 metre high sticks right around the equator and lay the rope on. Let c be the earth s circumference r be its radius c be the added string length and r be the added radius. 15cm that s how far off the ground we re lifting the string remember out of 6 370km is close.

Student answer form blackline master rope around the world you have a piece of rope that just fits around the earth. 40 000 divided by 2 is 20 000. From there it s not hard to believe that adding 3 feet to a rope around the actual earth would raise it almost 6 inches. This below is one answer i saw.

The idea is to imagine the earth is a cube or just a square really and ask yourself if you added say 8 feet to the rope how far would that raise it above the square earth. Now imagine the rope is made just one meter longer and lifted uniformly off the surface until it is once again taught. Rope around the earth puzzle imagine a rope that fits snugly all the way around the earth like a ring on a person s finger. 2pi or approximately 6 28 feet for both the basketball and the earth.