Stars in the process of forming are called
a. giant planets.
b. brown dwarfs.
c. red supergiants.
d. protostars.
d
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The acceleration due to gravity at the surface of Planet X is 10 m/s2 . What is the acceleration due to gravity at an altitude of 4000 km above the surface of this planet?
a. 10 m/s2 c. 4.4 m/s2 b. 8.0 m/s2 d. More information is needed.
All the planets in the Solar System revolve in a clockwise motion
a. True b. False Indicate whether the statement is true or false
The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for
A) cross-breeding between organisms B) artificial selection C) genetic mutations D) convergent evolution toward intelligence
Rutherford's experiment, in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil, showed that nuclei were very much smaller than the size of an atom because
a. some alpha particles passed through the foil undeflected. b. some alpha particles were deflected backwards. c. some alpha particles were captured by the gold nuclei. d. the alpha particles could not get closer than 10?10 m to the gold nuclei. e. the alpha particles split into deuterium nuclei when they encountered the gold nuclei.