A piece of string is stretched tightly around the Earth along its equator. Imagine that this string along the equator forms a perfect circle, and imagine that to reach around that perfect circle, the string has to be exactly 25,000 miles long. Now imagine that you wanted to suspend this string 4 inches above the surface of the Earth, all the way around it. How much longer would the string have to be do do this?
Before you visit my blog to read any further, guess the answer. How much longer would the string have to be? A few inches? Several miles? What do you think?
6 Comments
Florin
30/03/2012
The string should be 8 X pi inches longer, that is about 24-25 inches longer. Apparenly it has nothing to do with how long the string is :-)
Arya
02/04/2012
Π * d = 25000
Π * (d+8) - Π * d = x(say)
Π * d + Π * 8 - Π * d = x
Π * 8 = x
x = 3.14 * 8 = 25.12
Arya
02/04/2012
&Pi * d = 25000
&Pi * (d+8) - &Pi * d = x (say)
&Pi * d + &Pi * 8 - &Pi * d = x
&Pi * 8 = x
x = 3.14 * 8 = 25.12
Ian
02/04/2012
I reckon 33 miles, 52 yards , 3.45 inches. Roughly.
Dzavid
18/04/2012
a few inches because O = 2 * r * 3.14 i.e. 2 * delta R * 3.14 = 2 * 4 * 3.14 = 25.15
Sukanta
14/08/2012
Current Circumference in inches
= 25000*63360
= 1584000000.00 inches
Current Radius
= 1584000000.00/2*3.14
= 252229299.36
New Radius
= 252229299.36 + 4
= 252229303.36
New Circumference
= 2*3.14* 252229303.36
= 1584000025.12 inches
Difference +25.12 inches
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