Both RR Lyrae and Cepheid variables are giants that ________ in size over time
Fill in the blank(s) with correct word
pulsate
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Coulomb's Law: Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?
A. A B. B C. C D. D
The low average densities of Jupiter and Saturn compared with Earth suggests ________.
A. they have no solid cores B. heavier elements must be in gaseous form in their interiors C. they are very hot D. they are hollow E. they contain large quantities of light elements, such as hydrogen and helium
Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1 . What is the ratio of the capacitance of Sphere #2 to the capacitance of Sphere #1? a. 1, since all conducting spheres have the same capacitance
b. 2 c. 4 d. 8 e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
What is the ionization energy of the neutral hydrogen atom?
A) 27.2 eV B) 13.6 eV C) 6.8 eV D) none of the given answers