If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object
A) accelerates in the direction of the applied force.
B) experiences decreased friction.
C) eventually slides to a stop.
D) none of the above
Answer: C
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The exospheres of the Moon and Mercury differ from the atmospheres of Venus, Earth and Mars in that
a. they are made of a very thin layer of carbon dioxide. b. they are made of a thick layer of water vapor. c. they extend much farther from the rocky surface. d. they are made of a thin layer of light atoms such as helium, sodium, and argon.
What is the approximate wavelength of red light?
A. 7 cm B. 5 m C. 400 nm D. 700 nm
2 waves traveling in opposite directions on a rope meet and undergo complete destructive interference. Which of the following best describes the waves a moment after the waves meet and coincide?
a. The waves no longer exist. b. The waves continue unchanged. c. The waves reflect and travel backward. d. A single wave continues along the rope.
When an ideal gas undergoes a slow isothermal expansion:
A. the work done by the gas is the same as the energy absorbed as heat B. the work done by the environment is the same as the energy absorbed as heat C. the increase in internal energy is the same as the energy absorbed as heat D. the increase in internal energy is the same as the work done by the gas E. the increase in internal energy is the same as the work done by the environment