General Physics (Calculus-Based), Volume 1 · 免费预览
13.4 卫星轨道与能量
正如本章开头所指出的，尼古拉·哥白尼首先提出地球和所有其他行星都绕太阳作圆周运动。他进一步指出……
1. Overview
Overview
2. Circular Orbits
Circular Orbits
3. Energy in Circular Orbits
Energy in Circular Orbits
4. Check Your Understanding
Check Your Understanding
5. Orbital velocity and period scaling with radius
By what factor must the radius change to reduce the orbital velocity of a satellite by one-half? By what factor would this change the period?
6. Satellite Orbit Center Assumption
There is another consideration to this last calculation of . We derived Equation 13.8 assuming that the satellite orbits around the center of the astronomical body at the same radius used in the expression for the gravitational force between them. What assumption is made to justify this? Earth is about 81 times more massive than the Moon. Does the Moon orbit about the exact center of Earth?
7. Gravitational stretching of interacting galaxies
Galaxies are not single objects. How does the gravitational force of one galaxy exerted on the “closer” stars of the other galaxy compare to those farther away? What effect would this have on the shape of the galaxies themselves?