Hi pls read this its worth it.(assujme earth as a complete sphere)(adsbygoogle = window.adsbygoogle || []).push({});

suppose i stand in india(place where equator passes) right now and now i begin my journey with a rope thousnands of kilometers long i follow the journey exactly on equator and return to the same place in india.means ihave tied a knot on the whole earth with the rope. the length of the rope would be equal to the lenth of the equator. Now suppose that i increase the lenth of the rope by 100 cm.so now as the rope's lenth haas increased it will get loosened by a small bit.

Now suppose that thousnds of men are standing side by sid along the equator.

now as the rope's lenthg has increased(by 100 cm) the rope would become loose.so these men along the equator will be able to lift the rope.ie the rope has become loose so each men standing side by side along the equator will liftthe rope.now as the rope is lifted by each men equally.the rope would itself form a huge circle whose circumference would be greater then earth by 100 cm.

now as the circum is greater,the radius(of the circle of rope) would be greater than the radius of the earth by a very very very small amount. the difference bbetween the radius of the earth and the radius of the circle of the rope would infact be the measure of the lift by the men of the rope. now this lift would be some 1or2 nanometer as common sense says.lets see the math way

radius of earth=r

radius of the circle of rope=R

now

2piR=2pir+100cm

2piR-2pir=100cm

2pi(R-r)=100cm

R-r=100/2pi

R-r=100/2*3.14

R-r=15.92 cm

Means appr 16 cm.SO BY JUST ADDING 100CM TO THE ROPE THERE IS A DIFF OF 16 CM IN THE RADII. i tried it on a cricket ball,a basket ball and thee answer comes same 16.00 cm

I hope you get the problem if not tell me i will try to explain it in a better way.

courtesy-million to 1

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# An excellent problem

Loading...

Similar Threads - excellent problem | Date |
---|---|

Plot compound parabolic concentrator in Excel | Mar 7, 2018 |

I A problem in combinatorics | Jan 17, 2018 |

B Why is the %change of the %change of a sequence so chaotic? | Oct 14, 2016 |

Excellent Calculus Practice | Sep 15, 2014 |

Excel data analysis | Oct 16, 2013 |

**Physics Forums - The Fusion of Science and Community**