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

只看該作者 · 發(fā)表于 2025-4-1 13:15:06

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.

只看該作者 · 發(fā)表于 2025-4-1 14:26:00

The Starry Messenger,now about a star—mass, size, chemical composition, brightness, temperature, distribution of matter (density), color, age, and energy production are some that come to mind. These characteristics are interrelated and all must be extracted from the light we get from the star.

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