This is our best seller for a reason. Relaxed, tailored and ultra-comfortable, you’ll love the way you look in this durable, reliable classic 100% pre-shrunk cotton (heather gray color is 90% cotton/10% polyester, light heather gray is 98% cotton/2% polyester, heather black is 50% cotton/50% polyester) | Fabric Weight: 5.0 oz (mid-weight) Tip: Buying 2 products or more at the same time will save you quite a lot on shipping fees. You can gift it for mom dad papa mommy daddy mama boyfriend girlfriend grandpa grandma grandfather grandmother husband wife family teacher Its also casual enough to wear for working out shopping running jogging hiking biking or hanging out with friends Unique design personalized design for Valentines day St Patricks day Mothers day Fathers day Birthday More info 53 oz ? pre-shrunk cotton Double-needle stitched neckline bottom hem and sleeves Quarter turned Seven-eighths inch seamless collar Shoulder-to-shoulder taping
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Regarding what happens to someone if they did feel the deceleration. According to the NTSB, the aircraft were traveling at 510 knots and 430 knots. So this is 257 m/s and 221 m/s respectively. The terminal velocity of a human body through the air is 53 m/s. As a person who has been around a few rock climbing fatalities, I can tell you what 53 m/s does to a person’s body. I was also in Yosemite to see the result of a couple that jumped off the top of Yosemite Falls in a double suicide. There is an old saying among rock climbers: It’s not the fall, it’s the sudden stop that kills you. The sudden deceleration at 53 meters per second splatters a body into many pieces which have to be picked up by the “baggy brigade”. The bodies in the airplanes were traveling 4–5 times faster than that.
If the car was moving faster, the pole intrudes further. If the car is traveling fast enough, say 200 MPH, the frame is never able to absorb enough energy to stop the car and the pole splits the entire car into two halves which continue in the direction they were traveling. I actually witnessed such a car crash. Regarding seeing the collision. Yes, it is possible. There is some disagreement on how fast the human brain can see. Wikipedia claims it takes the human brain 200 milliseconds to see light coming into the eye. This would probably be too slow. People in the back who happen to be looking forward toward the front of the plane might be able to see but perhaps not understand that something was happening.
Does the propagation of the impact shock wave propagate at the speed of sound? There is an acoustic wave that propagates backward through the fuselage but that is not the wave we are interested in. It is an elastic wave traveling back through the airframe that is important. The two waves travel at different speeds depending on the material. This elastic wave has to do with stiffness, shear of the metal parts and their ability to spring back to their original shape. Understanding deceleration during a crash. Imagine a car hitting a power pole. The car frame and bumper are not stiff. At 60 miles an hour, the bumper hits the pole and stops but the car behind the bumper is still moving at 60 miles an hour. The pole begins to intrude into the hood and yet most of the mass of mass of the car is in front of the pole and Still moving at 60 miles per hour. We are now 30 milliseconds into the crash. Now as the engine hits the pole, a significant amount of energy is absorbed and the stiffness of the frame is enough to slow down the remaining mass. At 40 milliseconds the remaining car in front of the pole is going to stop. Deformation of the car’s frame absorbs most of the remaining energy of the crash. This deformation travels as a shockwave backward through the car. This shockwave travels backward quickly but not instantaneously.
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