What type of bond is formed whenever atoms share a pair of electrons?
a. covalent
b. hydrogen
c. ionic
d. double
e. peptide
a
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The kinetic energy of an object:
a. is inversely proportional to its speed. b. is directly proportional to its speed. c. sometimes increases with increasing speed and sometimes decreases. d. is directly proportional to the square of its speed. e. is inversely proportional to the square of its speed.
Which is used observationally to determine the age of a star cluster?
A) the total number of main-sequence stars B) the luminosity of the main-sequence turn-off point C) the amount of dust that lies around the cluster D) the number of white dwarfs E) the ratio of giants to supergiants
If the scalar (dot) product of two vectors is negative, it means that
A. there was a calculator error. B. the angle between the vectors is less than 90 degrees. C. the angle between the vectors is 90 degrees. D. the angle between the vectors is greater than 270 degrees. E. the angle between the vectors is between 90 and 180 degrees.
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.