When a gas changes phase to become a solid, energy is
A) absorbed.
B) released.
C) unchanged.
Answer: B
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Two parallel plates of infinite extent perpendicular to the page are situated relative to each other as shown in the figure. The upper plate is at 300°C and the lower plate is at 100°C. Determine the net rate of radiation heat transfer from the upper and lower plate assuming the environment is at a temperature below 100°C. Assume that both the lower surface of the upper plate and the upper surface of the lower plate are black.
GIVEN • The planet Mars revolving around the sun • Diameter of Mars (Dm) = 6600 km • Distance from the sun (Rms) = 225 × 106 km • Diameter of the sun (Ds) =1,384,000 km FIND (a) The equilibrium temperature of Mars (Tm) (b) Tm assuming that the albedo of Mars = 0.15 ASSUMPTIONS • Both Mars and the sun act as blackbodies • The sun has an equivalent blackbody temperature (Ts) of 5600 K PROPERTIES AND CONSTANTS The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum height?
A. 22.3 m B. 27.5 m C. 30.5 m D. 36.7 m E. 20.0 m
Double-Slit Interference: In a double-slit experiment, the slit separation is 1.75 mm, and two coherent wavelengths of light, 425 nm and 510 nm, illuminate the slits. At what angle from the centerline on either side of the central maximum will a bright fringe from one pattern first coincide with a bright fringe from the other pattern?
Fill in the blank(s) with the appropriate word(s).
About where is our solar system located within the Milky Way Galaxy?
A) at the center of the galaxy B) about 10 percent of the way from the center of the galaxy to the edge of the galactic disk C) about halfway from the center of the galaxy to the edge of the galactic disk D) near the far edge of the galactic disk E) in the halo of the galaxy above the galactic disk