In the rough approximation that the density of a planet is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the planet at a distance r from the center is gr/R, where R is the radius of the planet. (For the Earth, at least, this is only a rough approximation, because the outer layers of rock have lower density than the inner core of molten iron.) What is the value of g for a planet of mass 4.0 x 1024 kg and radius 5.00 x 106 m? 9 = N/kg Using the uniform-density approximation, calculate the amount of energy required to move a 200 kg mass from the center of this planet to the surface. E = For comparison, how much energy would be required to move the mass from the surface of the planet to a great distance away? E= J

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In the rough approximation that the density of a planet is uniform throughout its interior, the gravitational field strength
(force per unit mass) inside the planet at a distance r from the center is gr/R, where R is the radius of the planet. (For the
Earth, at least, this is only a rough approximation, because the outer layers of rock have lower density than the inner core
of molten iron.)
What is the value of g for a planet of mass 4.0 x 1024 kg and radius 5.00 x 106 m?
9 =
N/kg
Using the uniform-density approximation, calculate the amount of energy required to move a 200 kg mass from the center
of this planet to the surface.
E =
]
For comparison, how much energy would be required to move the mass from the surface of the planet to a great distance
away?
E=
]
Transcribed Image Text:In the rough approximation that the density of a planet is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the planet at a distance r from the center is gr/R, where R is the radius of the planet. (For the Earth, at least, this is only a rough approximation, because the outer layers of rock have lower density than the inner core of molten iron.) What is the value of g for a planet of mass 4.0 x 1024 kg and radius 5.00 x 106 m? 9 = N/kg Using the uniform-density approximation, calculate the amount of energy required to move a 200 kg mass from the center of this planet to the surface. E = ] For comparison, how much energy would be required to move the mass from the surface of the planet to a great distance away? E= ]
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