A stellar core with a mass greater than 3 solar masses will collapse until it reaches _____
a. the radiusof Earth
b. the radius of Mt. Everest
c. the radius of a grain of sand.
d. the radius of a helium atom
e. a radius of zero
e
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An object's "momentum" is defined as
A) its force time is velocity. B) its mass times its speed. C) its force times its distance. D) its mass times its velocity. E) its weight times its speed.
If in a double-slit experiment the slit separation is increased, which of the following happens to the interference pattern shown on the screen?
A) The minima get closer together. B) The maxima stay at the same position. C) The minima and maxima stay at the same position. D) The minima stay at the same position. E) The maxima get further apart.
For a point on a spinning disc in uniform circular motion, which of the following is not constant?
a. Its angular speed. b. Its angular acceleration. c. Its centripetal acceleration. d. The magnitude of its total acceleration.
What are interstellar grains?
A. the material out of which exoplanets are formed B. droplets of material that have condensed out of the Solar nebula C. tiny dust particles that are part of interstellar clouds D. leftover fragments of planetesimals that are blown out of the Solar System