Four identical spheres each of radius 10cm and mass 1kg are placed on a horizontal surface touching one another so that their centres are located at the corners of square of side 20cm. What is the distance of their centre of mass from centre of either sphere.
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Beauty1999:
The center of mass is at the intersection of 2 diagonals. Distance from the center of either sphere is 10(2)^1/2
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centre of mass is at the point of intersection of two diagonals of square
Therefore distance=√10^2+10^2
=√200
=10√2
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