Many variants of gas turbine engines, such as those seen on most airliners, collect the necessary air through fanlike rotary compressors. A ramjet, however, doesn't use a compressor. Instead, the airplane builds up speed, which forces air through forward-facing vents in the engine. In this ...
For the latter, the peak resultant force is reached after 65 ms. Increasing muscle stiffness accordingly leads to an increasing probability of hip fracture or dislocation according to the presented injury risk curve [52]. Fig. 10 Resultant forces and injury probabilities for the hip and...
Among them is the problem of a proper renormalization of the two- nucleon potential. Another issue are the subleading many-body forces, where the "explosion" of the number of terms with increasing order and the order-by-order convergence are reasons for concern. In this talk, I will mainly...
In November 2004, NASA's eight-year, $230-million Hyper-X Program produced a scramjet that reached Mach 9.6 on its final flight. Some analysts believe the technology could reach Mach 15-24, but air travel at hypersonic speeds means overcoming forces unlike those faced by even the fastest ...
If the solenoid had an electrical current of 1.08 A, how many turns of wire does the solenoid have? How much horsepower can you gain from a cold air intake? Calculate the kinetic energy of a 108 kg scooter moving at 10 m/s. How many elementary forces are there? What is the momentum...
NASA destroyed the first jet in 2001 when it malfunctioned during a test. In 2004, each of the remaining two jets flew for just 10 seconds (achieving Mach 6.8 and then Mach 9.6, respectively) during test flights, then crashed into the ocean after 10 minutes of gliding. ...
What is a proper running foot strike? There’s not one perfect foot strike for everyone. A lot of people swear by a midfoot landing to be the best and the most efficient foot strike. And that’s true for many runners. However, there are plenty of injury-free people who run on their...
1914: US space pioneer Robert Hutchings Goddard (1882–1945) is granted his first two patents describing liquid-fueled, multi-stage rockets—ideas that will, many years later, help fire people into space. 1925: Pratt & Whitney (now one of the world's biggest aero-engine makers) builds its...
The result is that the pods would have to travel very slowly, or engineers would have to build a massive tube to make traveling quicker. In that case, riders would be traveling several thousand miles per hour, subjecting their bodies to crushing G-forces when going around the slightest bend...
The core of the matter is this: Even a clear sky isn't empty. Our atmosphere is a massive fluid layer, and the right application of physics makes it possible for humans to traverse it. In this article, we'll walk through the basic principles of aviation and the various forces at work...