Semi Major Axis of Jupiter's Orbit & Asteroid Period

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SUMMARY

The semi-major axis of Jupiter's orbit is 7.8 x 108 km. According to Kepler's Third Law, the square of the orbital period (T) is proportional to the cube of the semi-major axis (a), expressed as T2/a3 = K. For an asteroid with an orbital period half that of Jupiter, the correct calculation involves using the relationship defined by Kepler's law rather than simple multiplication. The semi-major axis for the asteroid can be determined using the formula a = (T2/K)1/3.

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ghostbuster25
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my question is... the semimajor axis of the orbit of Jupiter is 7.8*108.
If an asteroid has an orbital period half of that of Jupiter what is the semi major axis?

All i did was times 7.8*108 by 1/2 and got 3.9*108.

Seems to simple!??

any comments much appreciated
 
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What does Kepler's third law say?
 
that the square of the orbital period is propotional to the square of the semi major axis.

im unsure of how to apply this though.

I believe T2/a3=K to be relivent but as i only know that the semi major of the sun and Jupiter is 7.8*108 I am confused what to do next
 

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