The motion of the Sun relative to the stars is from ________ to ________.
A. west; east
B. east; west
Answer: A
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Islamic scholars ________.
A. influenced the naming of bright stars B. made detailed studies of the motions of the planets C. developed algebra D. studied and expanded upon older texts in astronomy E. All of these choices are correct.
The quark and antiquark in a meson are always of the same flavor
a. True b. False Indicate whether the statement is true or false
The equation 1/2 N2 + 3/2 H2? NH3 is not appropriately written because
a. the number of atoms of each element on each side is not the same. b. fractional coefficients are not generally used. c. nitrogen is not diatomic. d. the product is N2H4, not NH3.
The proton-proton chain is
A) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium. B) the linkage of numerous protons into long chains. C) another name for the force that holds protons together in atomic nuclei. D) an alternative way of generating energy that is different from the fusion of hydrogen into helium.