A bound universe will ultimately end in a "cold death."
Indicate whether the statement is true or false
FALSE
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Earth doesn't experience a solar eclipse every month because
a. of unpredictable weather patterns. b. the Moon always keeps its same side toward the Earth. c. the Moon's orbit plane is not aligned with the Earth's orbit plane. d. its sometimes nighttime when the eclipse occurs. e. sometimes the Moon is too far away.
What is the half-life of a radioactive isotope?
A) the amount of time for half of a sample of the isotope to decay into a different element or isotope B) the amount of time for half of a sample of the element to decay into nothing C) half of the total time that the isotope has been in existence D) half of the amount of that element in the universe E) half of the age of the solar system
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c
Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice.)
A) Their kinetic energy keeps decreasing. B) Their electric potential energy keeps decreasing. C) Their electric potential energy keeps increasing. D) Their kinetic energy keeps increasing. E) Their acceleration keeps decreasing.