An atom's "atomic number" is
A) the number of protons in its nucleus.
B) the number of electrons orbiting the nucleus of the neutral atom.
C) Both of the above.
D) the number of electrons orbiting the nucleus of the ionized atom.
E) All of the above.
C
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A wheel rotating about a fixed axis has an angular position given by ? = 3.0 ? 2.0t3, where ? is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
a. ?1.0 rad/s2 b. ?24 rad/s2 c. ?2.0 rad/s2 d. ?4.0 rad/s2 e. ?3.5 rad/s2
The most striking example of solar variability was the
A) Dust Bowl drought of the 1930s. B) Maunder Minimum from 1645-1715. C) Sporer Minimum that doomed the Anasazi. D) fall of Rome. E) Joseph's seven lean years in the Old Testament.
If the length of a wire increases, its resistance __________
Fill in the blank(s) with correct word
A long, straight wire carrying a current is placed along the y-axis
If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you? A) clockwise, around the x-axis B) counterclockwise, around the x-axis C) counterclockwise, around the z-axis D) counterclockwise, around the y-axis E) clockwise, around the y-axis