The graph shows 
versus t for an object moving in a straight line. What is the average velocity from t = 0 s to t = 9 s?
A. 44 
B. 32
C. 22
D. 24
D. 24
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The greatest contribution of the Greeks to modern thought was:
A) the idea that all the planets orbited the Sun. B) that their mythology was the basis for the naming of the constellations. C) that their observation of stellar parallax proved the Earth orbited the Sun. D) the development of scientific inquiry and model building. E) the invention of the telescope.
How is the unit of a tesla defined?
a. 10,000 tesla is one coulomb. b. The strength of the electric field one meter away from a point charge of 1 coulomb is one tesla. c. The strength of the electric field at a distance of 1 meter from a long straight wire carrying a charge of 1 coulomb per meter is one tesla. d. The strength of the magnetic field at a distance of 1 meter from a long straight wire carrying a current of 1 ampere is 2 × 10^-7 tesla. e. One tesla is one thousand volts.
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
__________ is the collective name given for particles that interact via the strong force
Fill in the blank(s) with correct word