The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring
A) the precise wavelengths of spectral lines in the spectrum of the star.
B) the precise wavelengths of spectral lines in the spectrum of the orbiting planet.
C) the precise brightness of the star divided by the precise brightness of the planet.
D) the orbital period of the planet that is orbiting the star.
A) the precise wavelengths of spectral lines in the spectrum of the star.
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____________________ formed as Mercury cooled and shrank
Fill in the blank(s) with correct word
Gravitational Force: Two small balls, A and B, attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force on each one?
A. 16F B. 8F C. 4F D. F E. F/4
Within cosmology, inflation is the idea that
A. the diameters of distant galaxies are much greater than those of galaxies near us. B. the force of gravity suddenly grew stronger in the distant past. C. the number of galaxies we see at large distances is greater than the number we can see near us. D. the Universe increased dramatically in size in an extremely brief period of time.
Speed indicates how fast something is moving and in which direction it is moving
Indicate whether the statement is true or false