A newly discovered planet has twice the mass of the Earth, but the acceleration due to gravity on the new planet's surface is exactly the same as the acceleration due to gravity on the Earth's surface. The radius of the new planet in terms of the radius R of Earth is (A) 1/2R (B) √2/2R (C) √2R (D) 2R (E) 4R

The value, represented by r earth, equates to roughly 6,371,000 meters (6.371 x 106 m). This equates to 3,960 statute miles or around 6,371 kilometers (km). The formula r = (A/) can be used to determine the radius of a circle using area.

What is the formula for Kepler's third law?

The period of a planet's orbit (P) squared is equal to the size of the semi-major axis of the orbit (a) cubed when it is stated in astronomical units because P2 = a3 according to Kepler's Third Law. If the mass of the planet is known, Kepler's Third Law can be applied to determine the planet's orbital radius.

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