A needle can't stay  for some seconds in air while tons heavy airplane stuck up in air for hours. Why?
480159
An airplane's design helps it create and maintain lift and thrust. A needle's does not.
3563
It could be a sign of infection or hormonal imbalance.  If you are are changing a pad or tampon in an hours time, this is excessive bleeding which should be checked out immediately by going to your closest ER as excessive bleeding can lead to anemia.  \nIn any case, please see your dr asap as this is not normal.
1158529
The "black box" is actually bright orange, so it can be found easily.  It's made of quarter inch thick stainless steel, while the skin of a plane is made of aluminum about 28/1000 of an inch thick.  If the plane were built of materials even 1/10 the strength of the black box, it could never get off the ground.\n\nEven if you could make a plane out of concrete and steel I-beams, and somehow get it to fly, if it hits the ground at 100mph, it's going to get crunched, no matter how strong it is.  That energy has to go *somewhere*, and a good portion of it will go into the plane's structure.
373377
use the space needle!
99997
Increased lift at low altitude due to ground effect, yah? \n\nI'm curious.  You apparently know the answer, so why ask the question?
923735
When we inject drugs into people, they are in solution.  It's tough to get chunks of medicine through needles, and they would just cause an emboulus anyway.
913404
I have been injecting people for almost 50 years & have only had to pull the needle out once as it was in a vessel.  NSS will not hurt anyone & is iostonic.  Not to worry.  You may have been pulling on the plunger when you took the needle out.  When you pull back on the syringe, be sure to wait a second to be sure there is no blood.  goood luck - you'll be fine!
971521
They don't have needles that small..................
773547
This is because they were desinged to be able to take off and stay suspended in air while moving foward. if they all oversudden moved reverse they would crash since the wouldnt be able to force themselves up due to their bodies desing.\nMake a paper plane then throw it foward. then try throwin it rear facing front (infact it will turn up then crash down due to the resistance of air to the bodys movement)
530229
If sticky tape is put on balloon where the needle goes through it, then the structure of the ballon is supported around the hole and doesn't implode
636833
Because the top side and bottom side of wings are shaped differently, air travels at different rates over the surfaces, causing lift.  The answer is C.
196622
I pierced a candle with the needle and carefully placed the needle on water surface. It floated well. \n\nThis due to the surface tension effect.\n\nNext I did with another needle without wax coating. This time it floated once in many trials.\n\n\nNext I placed the needle on a piece of blotting paper and placed it on the surface of water. The blotting paper in few seconds went inside leaving the needle floating.
680049
Great question, and you have the answer within the question!   It's air pressure that allows an airplane to rise into the air.  The secret is to get more pressure pushing up than pushing down.\n\nMany years ago scientists discovered that fast moving air exerts less pressure than slower air.  So you have to get the air on top of the plane's wing moving faster than the air on the bottom of the wing.  How do you do that?  Curve the top of the wing!   Then the air has to travel farther (to go over the curve), so it's going to go faster.  The bottom of the wing is flat - slower air, more pressure up against the wing.  \n\nThe difference between the two pressures - under and over the wing - is enough to make even a huge 747 go up into the air - if the air is flowing fast enough.  That's why an airliner has go almost 200 km/hr (or well over 100 mph) to before it starts to fly.
416939
There are chemicals in the air and its just how the light might have been bent. There are tons of different atmospheric problems that could have caused that.
1056202
Make sure your foot is down and the guide up (pressure)\nCheck your needle tension,\nThen try the bobbin.
418087
This is very similar to the floating of a (slightly oily) needle on the water. Surface tension acts like a stretched elastic membrane. The water is always trying to minimize its free surface area (that is, surface that is not contacting and wetting some solid).\nWhen you put an unwettable object on the water it stretches the surface which increases the surface tension. This tension holds up the needle. When you push a tube with an unwettable inner surface into the water, the surface tension tries to minimize the unwetted surface area by not rising into the tube. It will reach a level in the tube that balances the bouyancy due to the immersed air with the surface tension.
61716
The air inside the vehicle is moving the same speed as the vehicle. To the fly it's still air, unless a window is open, then the fly may not be able to fly normally.