What do we mean when we say that the rotation curve for a spiral galaxy is "flat"? what do we mean when we say that the rotation curve for a spiral galaxy is "flat"? the disk of a spiral galaxy is quite flat rather than spherical like the halo. gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward. the amount of light emitted by stars at different distances is about the same throughout the galaxy. all the galaxy's mass is concentrated in its flat, gaseous disk?

Hich of the following best summarizes the text’s depiction of the ancient indus valley cities (namely harappa and mohenjo-daro)? a. the cities were very plain and simple; the people did not focus on art and architecture, devoting their time instead to agriculture and the bare essentials. b. the cities were adorned, or decorated, with almost overwhelming displays of wealth and artistic architecture. c. the cities were extremely clean, relying on an advanced water and sewer system, though this was mainly constructed for the innermost areas of the cities. d. the cities were clean and peaceful, and they were designed in an extremely organized fashion, using an advanced water and sewer system to keep them this way

What acceleration is produced when a 3,000-n force acts on a 1,200-kg car? ignore the friction

What is the primary purpose of a game reserve?