Ground telescopes view the light coming from celestial objects through the turbulent atmosphere of the Earth. The distortion effect this turbulence causes to the light passing through it is called:
a. dispersion
b. seeing
c. blending
d. refraction
Ans: b. seeing
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What is the thermal resistance of a 10 m^2 insulation board, 30 cm thick, and having thermal conductivity of 0.03 W/m?K?
What will be an ideal response?
According to the second law of thermodynamics,
A) the total entropy of all the participants in any physical process cannot decrease. B) thermal energy flows spontaneously from hot objects to cold objects. C) energy process that uses thermal energy to do work must have a thermal energy exhaust. D) All of the above. E) None of the above.
During a star's main sequence portion of its life it does not change size appreciably. This observation indicates that
A. the Sun produces about the same amount of energy as it radiates into space. B. the Sun produces less energy than it radiates into space. C. the Sun produces more energy than it radiates into space.
Planes traveling between Seattle and Tokyo often go near Alaska because
A) the distance is shorter. B) there is less air traffic to contend with. C) planes travel faster in cooler air. D) the plane can stay over the safety of land for longer.