26.37600 if 8.4 is the diameter, and 52.65200 if 8.4 is the radius. I used 3.14 for pi
Answer:
The heliocentric model of the solar system is the one that suggests that the sun is in the center of the universe and everything revolves around it.
Explanation:
There have been few models throughout history when it comes to the arrangement and hierarchy of the objects in space. Most of them have been wrong, though they have persisted for a very long time. Some, like the heliocentric model, got some basics right, but it still had some mistakes which from today's perspective are big ones.
The heliocentric model suggests that the Sun is the center of the universe, with all other objects in space orbiting around it. Now, it did guess right that the planets in the solar system revolve around it and that it is in the center of it, but it made a big mistake by putting the Sun in the center of the universe, not just the solar system. Not just that the Sun is not in the center of the universe, it is not even close to the center of the galaxy in which it is, nor it is the largest object or the one with the biggest gravity so that it attracts everything around to revolve around it.
1-A
2-C
3-A
4-B
Those are the answers
Answer:
Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
Ans: waterfalls are most common where hanging valleys occur. Such valleys generally form when glacier ice deeply erodes a main or trunk valley, leaving tributary valleys literally hanging far above the main valley floor. After the glaciers have melted and withdrawn, streams from such tributary valleys must fall in order