Which blurs our Earth-based view of celestial objects?
a. the Sun
b. the Moon
c. Earth's atmosphere
c
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The speed an object needs to move away from the gravitational pull of Earth is called
A. orbital velocity. B. random velocity. C. rotational velocity. D. escape velocity.
The ____ is responsible for binding the electrons to the nucleus
a. Kirchhoff's law b. ground state c. temperature d. Coulomb force e. Balmer series
In order for a body to exhibit simple harmonic motion there must be
A. a force drawing the body toward the center and decreasing with distance away from the center. B. a force drawing the body toward the center and increasing with distance away from the center. C. a constant force drawing the body toward the center. D. a constant force pushing the body away from the center. E. a force pushing the body away from the center and increasing with distance away from the center.
As a white dwarf cools its radius will not change because
a. pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing. b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate. c. pressure does not depend on temperature because the white dwarf is too hot. d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels. e. material accreting onto it from a companion maintains a constant radius.