The rotation curve of the outer portions of the Galaxy revealed what about its mass?
What will be an ideal response?
The outer portions were moving faster than Keplerian motion, so the mass distribution is not like our centrally-focused solar system, but most of the mass lies farther out in vast amounts of dark matter.
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A baseball infielder, mass 75.0 kg, jumps up with velocity 2.00 m/s and catches a 0.150-kg baseball moving horizontally at 50.0 m/s. Of the following, which is closest to the final momentum of the system, infielder and baseball?
a. 158 kgm/s c. 152 kgm/s b. 155 kgm/s d. 150 kgm/s
The changing of a substance from a liquid into a vapor or gas is called
A) condensation. B) evaporation. C) dew point. D) saturation point.
Lithium has less binding energy than _____________, thus the neutrons and protons are easier to unbind from the nucleus
a. helium b. nitrogen c. carbon d. all of the other choices
Comets are rich in ________.
A. carbon dioxide (CO2) B. water C. carbon monoxide (CO) D. All of these choices are correct.