According to modern science, what was the approximate chemical composition of the solar nebula?
A) 98% hydrogen and helium, 2% everything else
B) 50% hydrogen and helium, 50% everything else
C) 98% hydrogen, 2% helium
D) roughly equal proportions of hydrogen, helium, water, and methane
A) 98% hydrogen and helium, 2% everything else
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Why are collisions between galaxies common, but collisions between stars rare?
A) Stars are very small compared to the distances between them, but galaxies are not. B) Stars repel each other with stellar winds, but galaxies do not. C) Stars are much less common than galaxies, so there are fewer of them to collide. D) Stars do not survive as long as galaxies, so they have less time to collide.
The Chandrasekhar limit is the largest ________ a white dwarf can have.
A. mass B. temperature C. speed D. wavelength
A rock is thrown straight down with an initial velocity of 14.3 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)
a. 81 m b. 48 m c. 38 m d. 22 m e. 31 m
Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have ________ energy
Fill in the blank(s) with correct word