Which of the following best describes tectonics?
A) the creation of bowl-shaped depressions by asteroids or comets striking a planet's surface
B) the eruption of molten rock from a planet's interior to its surface
C) the disruption of a planet's surface by internal stresses
D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
C) the disruption of a planet's surface by internal stresses
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Write the governing equation and the necessary boundary conditions for the problem of a heat exchanger tube as shown in Figure 2-54.
Dielectrics: The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills the region between the plates. What is the dielectric constant of the dielectric? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 61 B. 56 C. 50 D. 45 E. 67
If a conductor is in electrostatic equilibrium near an electrical charge:
a. the total charge on the conductor must be zero. b. the electric field inside the conductor must be zero. c. any charges on the conductor must be uniformly distributed. d. the sum of all forces between the conductor and the charge must be zero.
The Earth's lower atmosphere is kept warm by
A) solar radiation. B) terrestrial radiation. C) short-wave radiation.