Titlebook: Understanding the Universe; An Introduction to P James B. Seaborn Textbook 1998 Springer Science+Business Media New York 1998 Atom.Cosmolog

斷言

As the World Turns,ong the horizontal air track in Fig. 2.1 is in equilibrium. Equilibrium is not concerned with whether the body is in motion, but whether the motion is changing. How can we change the state of motion of a body? What are the conditions for equilibrium? Let’s see.

演繹

,What’s the Matter?,subdivide matter into smaller and smaller bits. He expected that on cutting matter into finer and finer pieces, eventually one would come to a bit of matter that could not be cut. In his view, there existed tiny fundamental building blocks or particles, which could not be divided any finer and from

medium

無畏

,Einstein’s Bundles,t light. Later, after Thomson’s discovery of the electron, it was recognized that the negative charge on the metal plate was due to an excess of electrons. These electrons absorbed energy from the electromagnetic field (ultraviolet radiation), increasing their kinetic energies sufficiently to break

不自然

The Great Dane,stars. Most commonly this “something” is light—electromagnetic radiation. To decode the information contained in the light, we have to know some things about how it is produced in the first place. What does the light tell us about the thing that is emitting the light? Ultimately, where does the ligh

包裹

crutch

Kaleidoscope

The Sun Is a Gas,orm a state of matter known as .—an . gas. To understand the physical processes that cause stars, like the sun, to shine and to understand how and why stars evolve, we must learn something about the behavior of gases. A quantity that is quite useful in describing the state of a fluid (gas or liquid)

的染料

The Sun Is a Nuclear Furnace, an incomplete one. Other factors contribute to bring about conditions in stars under which nuclear fusion can take place. Still other factors are responsible for converting the energy produced by fusion into forms more directly perceptible to our senses—forms such as light and heat radiation.

Ruptured-Disk