what is the radius of the planet ? (Take the planets to have the same mass density)

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The ratio of the weights of a body on the Earth’s surface to that on the surface of a planet is 9:4. The mass of the planet is 9/1 th of that of the Earth. If ‘R’ is the radius of the Earth, what is the radius of the planet ? (Take the planets to have the same mass density)
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Sep
The ratio of the weights of a body on the Earth’s surface to that on the surface of a planet is 9:4. The mass of the planet is 9/1 th of that of the Earth. If ‘R’ is the radius of the Earth, what is the radius of the planet ? (Take the planets to [...]
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Tags: The ratio of the weights of a body on the Earth's surface to that on the surface of a planet is 9:4. The mass of the planet is 9/1 th of that of the Earth. If 'R' is the radius of the Earth , what is the radius of the planet ? (Take the planets to have the same mass density) ,