Answer / guest

The cicumference of the earth is

= 2 * PI * r

= 2 * PI * 6400 km

= 2 * PI * 6400 * 1000 m

= 2 * PI * 6400 * 1000 * 100 cm

= 1280000000 * PI cm

where r = radius of the earth, PI = 3.141592654

Hence, the length of the thread is = 1280000000 * PI cm

Now length of the thread is increasd by 12 cm. So the new
length is = (1280000000 * PI) + 12 cm

This thread will make one concentric circle with the earth
which is slightly away from the earth. The circumfernce of
that circle is nothing but (1280000000 * PI) + 12 cm

Assume that radius of the outer circle is R cm

Therefore,

2 * PI * R = (1280000000 * PI) + 12 cm

Solving above equation, R = 640000001.908 cm

Radius of the earth is r = 640000000 cm

Hence, the thread will be separatedfrom the earth by

= R - r cm

= 640000001.908 - 640000000

= 1.908 cm

Answer / superpogi

R = old radius

R' = new radius

x = 12 cm

old length = 2piR

new length = 2piR' = 2piR + x

R' = R + x/(2pi)

separation = x/(2pi) = 12/(2pi) = 1.91 cm

Answer / roop anand

radius=6400000cm
circumference=2*pi*r
=2*3.14*6400000
=40192000cm

length is elongated by 12cm..
so circumference is increased br 12cm..
2*pi*r=40192000+12
=40192012cm
the new radius = 2*pi*r/2*pi
=40192000/2*(3.14)
=6400001.911
therefore the length of the distance its seperated from the
surface is = 6400001.911-640000
=1.911cm

Answer / naved

12cm only

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