What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) the strong force and the weak force
B) gravitational force and outward pressure
C) gravitational force and surface tension
D) the strong force and the electromagnetic force
B) gravitational force and outward pressure
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What is the beat frequency produced when two sound waves differ by two hertz?
a. Two per minute. b. One-half hertz. c. Two hertz. d. One hertz. e. Ten hertz.
The nuclei of different isotopes of a given element have the same number of
A) protons. B) neutrons. C) nucleons. D) electrons. E) positrons.
In the UNS designation system, high-strength low-alloy steels start with the letter _________.
Fill in the blank(s) with the appropriate word(s).
Much of the solar wind comes from ________ where the magnetic field does not loop back into the Sun
a. prominences b. coronal holes c. spicules d. granulation e. auroras