4 ms·
Wind resistance has to be a factor after 25mph, I mean it is on my electric bicycle. And holy cow, even 25mph is crazy fast, 35? If you tripped and fell at 35-
by ck2 12y ago
Wind resistance has to be a factor after 25mph, I mean it is on my electric bicycle.
And holy cow, even 25mph is crazy fast, 35? If you tripped and fell at 35-40mph you could seriously injure yourself.
I think I have a good question for the xkcd q&a site: how fast could Usain Bolt run on the moon (ignoring the oxygen problem).
Ah I see someone beat me to the moon problem. Here's another thought, without strong gravity to help return mass to the ground, running is probably much harder.
- maxerickson 12y agoThis analysis says Usain Bolt expends >90% of his energy on drag: http://iopscience.iop.org/0143-0807/34/5/1227/article http://iopscience.iop.org/0143-0807/34/5/1227/article (That is, yes, you are correct.) Answering my own question, he took 41 steps when he set the world record.
- thaumasiotes 12y ago> If you tripped and fell at 35-40mph you could seriously injure yourself. To be fair, this is quite true at walking speeds as well. Falling is bad. I passed out from dehydration once while standing still; I ruptured my spleen in the fall and almost needed surgery to have it removed (thankfully, it healed while I was under observation).