Assume earth to be a sphere of uniform mass density. The energy needed to completely disassemble the planet earth against the gravitational pull amongst its constituent particles is x × 10 31 J. Find the value of x. given the product of mass of earth and radius of earth to be 2.5 × 10 31 kg-m and g = 10 m/s 2 .
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CHECK THE SOLUTION.
(15)
Sol. W = 
= 
= 
= 
× 10 × 2.5 × 10 31 = 15 × 10 31 J
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