Why are trees limited to about 120 meters in height? Why are planets spherical, but asteroids not? Often the size of an object is determined by something simple but quite unexpected. The size of a cell and a star depend in part on the ratio of surface area to volume. The divide ...
The big difference between a maglev train and a conventional train is that maglev trains do not have an engine — at least not the kind of engine used to pull typical train cars along steel tracks. The engine for maglev trains is rather inconspicuous. Instead of using fossil fuels, the mag...
Then, in 1999, researchers at Harvard University were able to slow a beam of light down to 38 miles an hour (61 kilometers per hour) by passing it through a state of matter known as a Bose-Einstein condensate. That's almost 18 million times slower than normal! No one would have ...
Primary among non-fictional cosmic gamma-ray sources, are supernovas, neutron stars, and gamma-ray bursts, the most powerful explosions since the Big Bang, the cause of which is still shrouded in mystery. You may like 'Captain America: Brave New World' introduces adamantium into the MCU, ...
Iron is an element, and its symbol is Fe. Although iron rusts easily, people use it for making steel, automobile frames and parts, building structures and tools. The iron atoms is made of 26 protons, 26 electrons and has 30 neutrons. The atom has four sp
How big is a Planck length? What did Max Planck discover about blackbody radiation? What is the temperature of cosmic microwave background radiation? What is Planck energy? How long is 1 Planck time? How long is Planck time? How much Planck time is in a second?
What subatomic particles determine the mass of an atom? Calculate the potential at the electron due to the proton in the hydrogen atom a distance 5*10^-11 meters away. What is the probability of finding an electron in a p-shaped orbit?
Inside an atom Toward the end of the 19th century, science was barreling along at an impressive pace. Automobiles and aircraft were on the verge of changing the way the world moved, and electric power was steadily making its way into more and more homes. Yet even scientists of th...
The probability of a U-235 atom capturing a neutron as it passes by is fairly high. In a bomb that is working properly, more than one neutron ejected from each fission causes another fission to occur. It helps to think of a big circle of marbles as the protons and neutrons of an atom...
are high; therefore, the Reynolds numbers are very high. The big difference to fluid turbulence is that the dissipation is not mainly due to viscosity, but also not bound to the high wavenumber range. There are collisional and non-collisional (kinetic) effects that lead to the dissipation of...