A stone initially moving at 8.0 m/s on a level surface comes to rest due to friction after it travels 11 m. What is the coefficient of kinetic friction between the stone and the surface?
A) 0.13
B) 0.25
C) 0.30
D) 0.43
E) 0.80
C
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A mercury-in-glass thermometer reads an outside temperature of 20ºC. If the sky and surroundings of the thermometer have an average surface temperature of 5ºC, estimate the net radiation per unit area from or to the thermometer.
What will be an ideal response?
The study of astronomy involves
a. space. b. energy. c. matter. d. all of these.
Which of the following statements best describes the limitations of Newtonian physics?
A) At very high speeds, Newtonian physics gives very incorrect predictions, and is correct in other situations. B) At very high speeds, or at very small sizes, or for gases and liquids, Newtonian physics gives very incorrect predictions. C) Newtonian physics is approximately correct, to within 1 or 2 percent, in all situations. D) At high speeds, or at small sizes, or for large distances, Newtonian physics is incorrect. E) As far as we know, Newtonian physics is correct in all situations.
The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, and Neptune. C) Mercury, Venus, Earth, Mars, and Pluto. D) Jupiter, Saturn, Uranus, Neptune, Pluto, and Eris.