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.
Sound Speed in Helium. The speed of sound in helium at 0Â°C is about 972 m/s, compared to 331 m/s in air. This is consistent with the general relationship for sound speed in gases since the density of helium is so much less than that of air.