Posted by **tania** on Wednesday, January 12, 2011 at 6:57am.

The work done against a force F(r) in moving an object from r = r1 to r = r2 is integral F(r) dr limits R2 at top and r1 at bottom. The gravitational attraction between two masses m1 and m2 at distance d is given be F=GMM/d2, G = 6.67 x 10-11. Find the work done in lifting a 4000 kg payload from the surface on the moon to a height of 25000m above its surface. The mass of the moon can be taken as 7.3 x 1022 and its radius at 1.7 x 106.

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