A 150-N box is being pulled horizontally in a wagon accelerating uniformly at 3.00 m/s2
The box does not move relative to the wagon, the coefficient of static friction between the box and the wagon's surface is 0.600, and the coefficient of kinetic friction is 0.400. The friction force on this box is closest to
A) 450 N.
B) 90.0 N.
C) 60.0 N.
D) 45.9 N.
D
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Water at room temperature, 20°C, is pumped into a reactor core where it is converted to steam at 200°C. How much heat (in J) is transferred to each kilogram of water in this process? (csteam = 2 010 J/kg?°C; LV,steam = 2.26 × 103 J/g; 1 cal = 4.186 J.)
A. 3.35 × 105 B. 7.53 × 105 C. 2.67 × 106 D. 2.80 × 106 E. 3.01 × 106
A rubbed balloon will stick to a wooden wall, which demonstrates charge
a. transfer. b. potential. c. conservation. d. polarization.
The evidence favors a universe whose overall geometry is flat. That evidence comes from observations of
A) the earliest galaxies in the universe. B) the force of gravity acting on laboratory objects. C) the center of our galaxy. D) the cosmic background radiation. E) distant quasars.
Which of the following provides evidence for the existence of dark matter?
A. The orbital speeds of galaxies in clusters are higher than what can be accounted for by the detectable mass of the cluster. B. the ability of rich galaxy clusters to prevent their hot gases from expanding C. The orbital speeds of stars in galaxies are higher than what can be accounted for by the detectable mass in the galaxy. D. All of these choices are correct.