If the value of ‘g’ acceleration due to gravity, at earth surface is 10 m/s2 , its value in m/s2 at the centre of the earth, which is assumed to be a sphere of radius ‘R’ metre and uniform mass density is
(a) 5 (b) 10/R
(c) 10/2R (d) Zero
Answer: d
(16)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)