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View Diary: I need to talk to a scientist (36 comments)

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  •  This is exactly right (8+ / 0-)

    I was about to respond, but Ralphdog said it perfectly.

    Your other question dealt with action-reaction.   When you swing, your body will move backwards.   If you try to move your arm forward while standing on ice, this will be obvious (try it, it's still winter).   If you are not on ice, then contact with the earth will transfer some of that reaction to the earth, changing its rotation speed by a VERY small amount.

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