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April 18, 2015

Homework Help: space/astronomy

Posted by zack on Monday, November 30, 2009 at 9:17pm.

Rank the objects based on the strength of the gravitational force that would be felt by a spacecraft traveling at a distance of 10 AU from the center of each of the objects, from weakest to strongest.

1)red giant mass: 1Msun radius: 100Rsun
2)sun
3)white dwarf mass: 1msun radius: 0.01Rsun
4)black hole mass: 1msun radius: (event horizon) approx. 3 km

Please help me rank them, I though that it would be by the radius since as radius increases , gravitational pull decreases and the mass is the same i ranked it weakest to strongest 1,2,3,4 but i think the black hole is not supposed to be strongest since its 10 AU and its only strong at the event horizon.. please help!

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