A Planet in Another Solar System Orbits a Star with a Mass

question 46

Multiple Choice

A planet in another solar system orbits a star with a mass of 4.0 x 10³⁰ kg.At one point in its orbit it is 250 x 10⁶ km from the star and is moving at 35 km/s.Take the universal gravitational constant to be 6.67 x 10^-11 m²/s² .kg and calculate the semimajor axis of the planet's orbit.The result is:

• A)79 x 10⁶ km
• B)140 x 10⁶ km
• C)290 x 10⁶ km
• D)320 x 10⁶ km
• E)590 x10⁶ km

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