Question

The planet Neptune travels in a nearly circular orbit of radius , r = 4.5 × 109 km, about the sun. It takes Neptune 165y to make a complete trip around the sun. How fast (in km/h) does not Neptune travel in its orbit ?

Answer 1

Answer:

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Explanation:

As, T1=TEarth=1yrandT2=TNeptune=165yr

Let R1andR2 be the radii of the circular orbits of the earth According to Kepler's third law

T21T22=(R31)R32R32⇒R32=R31T22T21⇒R32=R31×(165)212

⇒R32=1652R31⇒R2≈30R1

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