Re: Facebook: See if someone is online but not your friend. You can't see if someone is online or not if they arent in your friends list. and even if the account is private you should still be able to send a friend-request or a message. If you think she is cheating on you, you have more than just a facebook problem ..
A â 0.22 (meters per beat) U â 3*15*0.22 â 9.9. ... to estimate that the airspeed velocity of an unladen European Swallow is 10 meters per second. With some further study, it became clear that these estimates are accurate, though perhaps coincidental.
The European Swallow (Hirundo rustica) must beat its wings 18 times per second to remain airborne (not 43 as is popularly believed). Comparing this with the average amplitude of their wing beat we come out to an average airspeed of about 11 meters per second (approximately 24 miles an hour). This is cruising speed, mind you.