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Oh, try uploading the image to a site like imgur, and then copy the direct link to the image in the spoiler tag.
You must press "Place inline" for attached image, then enclose it in spoiler.
Let us hope that gets added when gameplay becomes a thing in SE
If the mass of atmosphere is ejected tangentially at the escape velocity, then using some crude but reasonable approximations I get a change in angular frequency of 4.2x10[sup]-6[/sup] rad/s, for a final rotation period of about 17 days. But of course that can be shortened further by increasing the ejection speed like you said.Venus - It has a little bit thinner atmosphere than Earth. I calculated it's new rotation period by turning most of it's thick atmosphere mass into rotational momentum and added it on top of the slow rotation of Venus. (The idea was to shoot the atmosphere off at more than the escape velocity. My calculations may be inaccurate or outright wrong)