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# Kepler's Third Law / Sunlight to Pluto

I need written out steps and final answer.

These 2 questions are giving me a headache. I've been working on them for 2 days and I still can't figure it out. My teacher cannot break it down enough for me to understand.

1. Use the modified form of Kepler's third law to calculate Pluto's mass from the orbital data for Charon (average radius = 19,600 kilometers, 6.4 days to complete a trip around the planet). Be sure to convert the orbital period to seconds and the orbital radius to meters before putting those numbers into the formula. (Assume that Charron's mass is negligible compared to Pluto's).

2. How long does it take sunlight to reach Pluto?

thank you!

#### Solution Preview

Hello and thank you for posting your questions to Brainmass.

The solution is attached in two files which are identical in content but differ in format. One is an MS-Word document while the other is a Acrobat pdf file. Therefore you can choose the most suitable file for your needs.

The modified Kepler's law states that:

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#### Solution Summary

The expert examines Kepler's third law to determine sunlight to Pluto.

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