Mastering Physics Ch. 9! Help!?

Q

qkc

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In this problem, you will calculate the location of the center of mass for the Earth-Moon system, and then you will calculate the center of mass of the Earth-Moon-Sun system. The mass of the Moon is 7.35×1022 , the mass of the Earth is 6.00×1024 , and the mass of the sun is 2.00×1030 . The distance between the Moon and the Earth is 3.80×105 . The distance between the Earth and the Sun is 1.50×108 .
Part A: Calculate the location of the center of mass of the Earth-Moon system. Use a coordinate system in which the center of the Earth is at and the Moon is located in the positive x direction.

Please, Help
 
The centre of mass of the Earth-Moon system is (7.35E22/6.00E24) x 3.80E5 km from the centre of the Earth in the direction of the centre of the Moon. This works out as 4655 km from the centre of the Earth, which is inside the Earth's mantle. You don't complete your question, but using a similar line of reasoning, the centre of the Earth Moon Sun system will be in a location which depends on the relative positions of the Sun, Moon and Earth, and this will be inside the Sun, which is more than 300 000 times as massive as the Earth and Moon.
 
The centre of mass of the Earth-Moon system is (7.35E22/6.00E24) x 3.80E5 km from the centre of the Earth in the direction of the centre of the Moon. This works out as 4655 km from the centre of the Earth, which is inside the Earth's mantle. You don't complete your question, but using a similar line of reasoning, the centre of the Earth Moon Sun system will be in a location which depends on the relative positions of the Sun, Moon and Earth, and this will be inside the Sun, which is more than 300 000 times as massive as the Earth and Moon.
 
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