A ball is released moving straight up at 15. m/s. At some time later it is falling downward at 15. m/s. What was the magnitude of its average velocity over this time period?
A) 0. m/s
B) 30. m/s
C) 15. m/s
D) 7.5 m/s
E) 22. m/s
A
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When there is electric current through a metal wire, the moving charges are
A) only protons. B) only electrons. C) both protons and electrons. D) positive metal ions. E) negative metal ions.
An object can move even when no force acts on it
1.True 2.False
What is the first law of thermodynamics?
a. The increase in the internal energy of a system is equal to the heat added plus the work done on the system. b. Heating a system makes it more disordered. c. The increase in the internal energy of a system is equal to the heat added times the work done on the system. d. The increase in the internal energy of a system is equal to the work done on the system. e. Objects in motion tend to remain in motion; objects at rest tend to remain at rest.
Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow? A) The value of flife is either 0 or 1, but not anything in between. B) The value of flife is between 0 and 1. C) The value of flife is less than 0.0000001. D) The value of flife is equal to 1/2. E) The value of flife is greater than 0.9.