11. Use Kepler's third law to calculate the period of Mars and Jupiter to demonstrate that Mars has a shorter orbital period than Jupiter. Use a= 1.52 AU for Mars and a= 5.2 AU for Jupiter. 12. What is the average distance from the Sun (a) of an asteroid with an orbital period of 1.2 years? 13. What would be the effect on the orbital period of a planet if its distance from the Sun doubled? [ Hint: This question is asking for a specific value. Pick some value for "a" and use it to find the period. Then, double the distance and recalculate. Compare the results by making a ratio of the periods you pick. ]