Two Planets Have Masses M and M, and the Ratio

question 28

Multiple Choice

Two planets have masses M and m, and the ratio M/m = 25. The distance between the planets is R. The point P is between the planets as shown, and the distance between M and P is x. At P the gravitational forces on an object due to M and m are equal in magnitude. The value of x is

• A) 5R/6.
• B) 25R/36.
• C) R/25.
• D) 6R/5.
• E) None of these is correct.

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