Aerodynamic shape: What is the
most aerodynamic shape? I've heard it is the shape of a falling raindrop but
wonder why jet fighters have pointed noses.
Black box: how long can an airplane's black box last underwater and still
provide useful information?
Black box: What materials are used in black
boxes, and how do they prevent it from destruction?
Fly off: Why do Navy aircraft fly off the aircraft carrier before the ship comes into
port?
Jets: How can a jet engine operate in heavy rains
or snows without flaming out?
Jet trail: I noticed at sunset that I can see jet trails at
a very far distance and, if the sun is just right, I can see the jet sparkling
in the setting sun. How far away is the horizon from the jet if it is flying
at 36,000 feet? Is it 50 miles, 100 miles, 200 miles?
Jet trails: Why do jets
leave white streaks in the sky?
Power
supply: My colleague today asked me a question that puzzles me a
lot!! Why do aircraft use 115 volts, 400 hertz (Hz) while our domestic supply
is 115 volts, 60 Hz! Why so different?
Sonic boom: What happens when a plane goes faster
than the speed of sound?
Speeds: What
speed do large passenger jetliners usually build up to on the runway before
they take off?
Supersonic: Who was
the first person to fly faster than sound travels? Was it with an
airplane?
|
Airspace---
balloons, skydiving |
Helium balloons: why do helium balloons come down in a few
days? Can't they make balloons that keep helium in?
Helium balloons: My daughter put her helium balloon in the bath with
her and now it won’t float. Do you know why?
Jets/balloons: I
thought that the sound barrier was broken in a balloon, before Yeager.
Am I right? Was there a sonic boom?
Skydiving: Doesn't terminal
velocity of a skydiver also depend on his altitude? I remember seeing a
skydiver who jumped from the edge of the earth's atmosphere (in a space suit)
and broke the speed of sound.
Bugs in
space: I know it's just a joke: astronauts cleaning bugs off their
windshield on a space walk. But it got me wondering. Do astronauts ever
really see bugs in space?
Colonization of a planet and the galaxy: How many and what ratio of men and women will be required
to create a healthy human population on another planet?
Hubble telescope: Can the Hubble Space Telescope discern any
manmade equipment left behind on the moon?
Mars rover:
Are the Mars’ Rovers still active or did they finally say goodbye?
New Horizon (Pluto)
I have been tracking the speed of the New Horizons spacecraft in the early
stages of its journey to Pluto, and have noticed an increase in speed.
What is causing this steady increase, and will it continue?
Orbit mechanics: is it possible for two spaceships to fly in
close formation to each other in Earth orbit?
Spacecraft speed: How fast do spacecraft cruise?
Solar sails: The idea of using sunlight to blow spacecraft across the Solar System will not
work, suggests a new analysis by Thomas Gold. How do solar sails work and is
Gold right?
Space clock:
Since time and speed is relative,
according to Einstein's theory of relativity, will an atomic clock on the
International Space Station be slower than a synchronized atomic clock on the
ground?
Space clock: Your answer on the International Space Station (ISS) clock neglects the fact
that a clock in orbit at any altitude is at zero gravity because centrifugal
force cancels gravity.
Space junk : Can space junk make a moonlet?
Space radiation: How did astronauts in the Apollo 14 mission survive
being exposed to high radiation doses in a short time?
Space station: How long does it take the International Space Station
to complete a revolution of the earth?
Space station : how can I spot the Space Station at
night?
Space station (ISS): How far away from earth does the space station
travel and at what speed?
Space travel: How long would it take earth's fastest space ship to
reach our nearest star (not counting Sol)?
Speed: Which goes faster, bullets or rockets, and how much faster?
Star Trek: How large is the Star Trek ship — if it were real?
Warp speed: How fast is warp speed?
Weightless: Today on CNN, they reported that the
astronaut and cosmonaut at the space station "lost weight" because of a
restricted diet. Without gravity effects acting on a space station
("weightless"), how do they determine that the men had "lost weight"?
