The Roche Limit Tells Us About the Point on a Rotating

question 55

Multiple Choice

The Roche limit tells us about the point on a rotating planet where the gravitational force at the equator is just equal to the necessary centripetal force needed for rotation. Assuming the planet to be a uniform sphere of density 5520 kg/m³, find the shortest period of rotation possible before exceeding the Roche limit G = 6.67* 10^-11 N · m²/kg²) .

• A) None of the following.
• B) 50 min
• C) 150 min
• D) 48 min
• E) 85 min

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