The charge on a glass rod which has been rubbed with silk is called positive:
A) by arbitrary convention
B) so that the proton charge will be positive
C) to conform to the conventions adopted for G and m in Newton's law of gravitation
D) because like charges repel
E) because glass is an insulator
A) by arbitrary convention
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The solar corona is shown as white lines streaming from the Sun and you are viewing it from Earth. Which eclipse are you observing?
a. annular eclipse b. total solar eclipse c. total lunar eclipse d. partial solar eclipse
Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
What is the "chicken-and-egg" type problem we face when trying to decide which came first–proteins or nucleic acids?
A) proteins and nucleic acids probably looked very different before the origin of life B) nucleic acids cannot replicate without proteins, and proteins cannot be made without nucleic acids C) early proteins and nucleic acids were very similar to each other D) proteins and nucleic acids are always present together at the same time
What is an unusual theoretical characteristic of quarks?
a. They have fractional charges. b. They are outside the concept of electric charge—it just does not apply to them. c. Even the electron is composed of quarks. d. Even in quantum mechanical terms, quark momentum is not conserved. e. They combine to form leptons.