The two ways that glacial drift is deposited are
A) as outwash and till.
B) laminar and turbulent.
C) as crevasses and meltwater.
D) ablation and accumulation.
Answer: A
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Which in its gaseous form is not a greenhouse gas?
A) molecular nitrogen B) carbon dioxide C) water D) methane
Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1 . What is the ratio of the capacitance of Sphere #2 to the capacitance of Sphere #1? a. 1, since all conducting spheres have the same capacitance
b. 2 c. 4 d. 8 e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
Most extrasolar Neptunes and Jupiters found to date have:
A) orbits very close to their parent stars, making them hot Neptunes and hot Jupiters. B) orbits that are more eccentric than those of planets in our solar system, with eccentricities greater than 0.1. C) orbits that are less eccentric than those of planets in our solar system, with eccentricities less than 0.01. D) much larger orbits than the jovian planets in our solar system.
A thin electronic circuit board, 0.1 m by 0.1 m in size, is to be cooled in air at 25°C. The board is placed in a vertical position and the back side is well insulated. If the heat dissipation is uniform at 200 W/m2, determine the average temperature of the surface of the board cover.
GIVEN
• Vertical circuit board in air
• Back is well insulated
• Board dimensions (L × H) = 0.1 m × 0.1 m
• Air temperature (T ?) = 25°C
• Uniform heat dissipation rate ( q G/A) = 200 W/m2
FIND
• The average temperature of the surface of the board (Ts)
ASSUMPTIONS
• Ambient air is still
• The board has reached steady state
• Radiation is negligible
SKETCH
