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The density of a newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of
P the earth. If the radius of the earth is \( R \), the radius of

W the planet would be
(a) \( 2 R \)
(b) \( 4 R \)
(c) \( \frac{1}{4} R \)
(d) \( \frac{1}{2} R \)
(2004)
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