Pluto is different from the outer planets in all of the following ways except which one?
A) Its surface temperature is very cold.
B) It is made mostly of ices.
C) Its orbit is not very close to being circular.
D) It has few moons.
E) It doesn't have rings.
A
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Isothermal aging curves in Figure 7.17 show that peak yield strength at aging temperatures of 450°F (232°C) and 500°F (260°C) occurs in times of 100.6 hours (4 hours) and 10-0.6 hours (0.25 hours), respectively. Calculate the activation enthalpy for precipitate formation in this alloy.
What will be an ideal response?
Energy Levels: What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 205 nm B. 104 nm C. 389 nm D. 486 nm E. 610 nm
An apple weighing 3 newtons hangs, motionless, from a tree branch. The net force on the apple is
A) impossible to determine from the information that is given. B) 3 newtons upward. C) 6 newtons downward. D) 3 newtons downward. E) None of the above.
The horizontal acceleration of a projectile
a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.