Human beings are not aware of the environment. People often say: its great for children to study on a clean campus. But this is not the case. Now there are paper planes everywhere on the campus. Looking at the classroom again, it is not too much to describe it as "garbage pile", bu...
A typical altitude might be around 13,000 feet (4,000 meters), which gives the jumper about 60 seconds of free fall -- the term used in skydiving to describe the moment the jumper exits the plane. It is possible to go as high as 16,000 feet (4,900 meters) without supplemental ...
heater, and filter for the incoming air. When we breathe through our mouth, these modifications to the air entering our lungs occur to a lesser extent. Our lungs are still able to use the colder, drier, dirtier air; but you may have noticed that breathingcold, dry, or dirty...
Many of these theories sought to describe light as a ray -- a straight line moving from one point to another. Pythagoras, best known for the theorem of the right-angled triangle, proposed that vision resulted from light rays emerging from a person's eye and striking an object. Epicurus ...
Useful partners – we describe companies that can help you master the process and deliver advantages in execution. Before we begin with the regulatory overview, we first turn to some common mistakes companies make when shipping hazardous materials (or dangerous goods – we will use the terms inter...
Hi I’m Ben and I’m 15 but i will sometimes make eye contact with a sad kid or angry or sacred but then i will feel this emotion that i don’t know how to describe its like half of me is that said emotion and the other is me and i feel normal but the other half is going...
Waves can describe sound, light or even the wavefunction of particles, but every wave has a wavenumber. This describes how it varies through space, and this depends crucially on the wavelength of the wave or its speed and frequency. For physics or chemistry students, learning to calculate a ...
China is Building a Massive Undersea Station How to Find a Vacuum Leak Humanity May Find Clues of Aliens Within 20 Years Is it Worth Getting a Hammer Drill? Is the U.S. Ready to Fight a New Kind of War? Russia Is Crushing the U.S. Navy in the Arctic...
No one can say exactly what gravity "is," but it is possible to describe it mathematically and in terms of other physical quantities and properties. Gravity is one of the four fundamental forces in nature, the others being the strong and weak nuclear forces (which operate at the intra-atomi...
(US3441290A: Vehicle safety system filed in 1967), Maurice Leising and colleagues at Chrysler (US3618981A: Inflatable device filed in 1969), and Irving and Emanuel Landsman (US3617073A: Automobile safety system filed in 1969), who were among the first to describe side-firing airbags for ...