# Animate the simulated planet you may need to increase

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Animate the simulated planet. You may need to increase the animation rate forvery large orbits or decrease it for small ones.The planetary presets set the simulated planet’s parameters to those like our solarsystem’s planets. Explore these options.Tip:You can changethe value of a slider byclicking on the sliderbar or by entering anumber in the valuebox. NAAP – Planetary Orbit Simulator 2/8
Question 6: (1 point) For what eccentricity is the secondary focus (which is usuallyempty) located at the sun? What is the shape of this orbit?
Question 7: (1 point) Create an orbit with a = 20 AU and e = 0. Drag the planet first tothe far left of the ellipse and then to the far right. What are the values of r1and r2at theselocations?
Question 8: (1 point) Create an orbit with a = 20 AU and e = 0.5. Drag the planet first tothe far left of the ellipse and then to the far right. What are the values of r1and r2at theselocations?
Question 9: (1 point) For the ellipse with a = 20 AU and e = 0.5, can you find a point inthe orbit where r1and r2are equal? Sketch the ellipse, the location of this point, and rand r2in the space below. Use document drawing capability or draw by hand to scan andsumbit.1NAAP – Planetary Orbit Simulator 3/8
Question 10: (1 point) What is the value of the sum of r1and r2and how does it relate tothe ellipse properties? Is this true for all ellipses? The sum of r1 and r2 is equal to the
Question 11: (1 point) It is easy to create an ellipseusing a loop of string and two thumbtacks. Thestring is first stretched over the thumbtacks whichact as foci. The string is then pulled tight using thepencil which can then trace out the ellipse.Assume that you wish to draw an ellipsewith a semi-major axis of a = 20 cm and e = 0.5. Using what you have learned earlier inthis lab, what would be the appropriate distances for a) the separation of the thumbtacksand b) the length of the string? Please fully explain how you determine these values.
Kepler’s 2nd LawUse the “clear optional features” button to remove the 1st Law features.Open the Kepler's 2nd Law tab.Press the “start sweeping” button. Adjust the semimajor axis and animationrate so that the planet moves at a reasonable speed.