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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A sky laboratory of mass 3 × 10^3 kg has to be lifted from one circular orbit of radius 2 R into another circular orbit of radius 3R. Calculate the minimum energy required if the radius of earth is R = 6.4 × 10^6 m and g = 10 m/s^2.

A sky laboratory of mass 3 × 10^3 kg has to be lifted from one circular orbit of radius 2 R into another circular orbit of radius 3R. Calculate the minimum energy required if the radius of earth is R = 6.4 × 10^6 m and g = 10 m/s^2.

Find the percentage decrease in weight of a body when taken 16 km below the surface of the earth. Take radius of the earth as 6400 Km.