/u/BadJokeHD's posts in /r/askscience
While shifting gears while riding a bicycle, is the relationship between power input and output proportional? Is there a gear which is the most efficient one?
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If I lost my arm and got a bionic replacement, could I (if it's mechanically possible for the prothesis) move my arm in ways that weren't possible with a normal arm? Like rotating my wrist by 360 degrees?
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