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Finding the Mass of a Planet

  • Thread starter mparsons06
  • Start date
  • #1
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Homework Statement



As an astronaut, you observe a small planet to be spherical. After landing on the planet, you set off, walking always straight ahead, and find yourself returning to your spacecraft from the opposite side after completing a lap of 25.9 km. You hold a hammer and a falcon feather at a height of 1.35 m, release them, and observe that they fall together to the surface in 25.7 s. Determine the mass of the planet.

2. The attempt at a solution

I don't even know where to start. Any pointers?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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You hold a hammer and a falcon feather at a height of 1.35 m, release them, and observe that they fall together to the surface in 25.7 s. Determine the mass of the planet.

2. The attempt at a solution

I don't even know where to start. Any pointers?
Try using this and a kinematic equation to find the acceleration. Then just use

g=GM/r2
 

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