What percentage of the Solar System's mass does the sun represent? A. 66% B. 77% C. 88% D. 95% E. 99% Reset Selection
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Chasen S.
A newly discovered planet $X$ , has twice the mass of Earth. Planet $X$ is orbited by a moon, which has twice the mass of Earth's moon. The orbital radius of the moon orbiting Planet $X$ is the same as the orbital radius of Earth's moon. How does the orbital speed of the moon orbiting Planet $X$ compare to the orbital speed of Earth's moon? (A) It orbits at the same speed as Earth's moon. (B) It orbits at $\frac{1}{2}$ the speed of Earth's moon. (C) It orbits at 2 times the speed of Earth's moon. (D) It orbits at $\sqrt{2}$ the speed of Earth's moon. (E) It orbits at $\frac{\sqrt{2}}{2}$ the speed of Earth's moon.
The mass of the earth is 81 times that of the moon and the radius of the earth is 3.5 times that of the moon. The ratio of the acceleration due to gravity at the surface of the moon to that at the surface of the earth is (a) 0.15 (b) 0.04 (c) 1 (d) 6
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