Gravitation Question 123

Question: The mass of the earth is [6.00×1024,kg] and that of the moon is [7.40×1022,kg] . The constant of gravitation [G=6.67×1011,Nm2/kg2] . The potential energy of the system is [7.79×1028,joules] . The mean distance between the earth and moon is [MP PMT 1995]

Options:

A) [3.80×108,metres]

B) [3.37×106,metres]

C) [7.60×104,metres]

D) [1.90×102,metres]

Show Answer

Answer:

Correct Answer: A

Solution:

[U=GMmr] [,7.79×1028] [=6.67×1011×7.4×1022×6×1024r] [,,r=3.8×108,m]



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