Which of the following stars will live longest?
A) 1 solar-mass star
B) 2 solar-mass star
C) 3 solar-mass star
D) 4 solar-mass star
A) 1 solar-mass star
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Inelastic Collisions: In an inelastic collision involving an isolated system, the final total momentum is
A. exactly the same as the initial momentum. B. more than the initial momentum. C. less than the initial momentum.
The visible parts of galaxies contribute about one-tenth of the critical density of the universe
Indicate whether the statement is true or false
A disk-shaped space station 125 m in diameter spins at a uniform rate about an axis through its center and perpendicular to the plane of the disk
If the acceleration of a point on the rim of the disk is to be equal to g, how long does it take for the station to make one revolution? Use g = 9.8 m/s2.
Leavitt's law is a relationship between
A) a Cepheid variable star's period and luminosity. B) a galaxy's distance and recession speed. C) a galaxy's distance and redshift. D) a main-sequence star's color and luminosity.