What is the difference between re-radiating surfaces and black body surfaces?
What will be an ideal response?
A reradiating surface is a perfect reflector in that it reflects the spectral
radiation precisely as it was received. A black body radiator absorbs all of the
radiation and then emits spectral radiation at the surface temperature of the
black body. If the spectral character of radiation is needed then the reradiating
surface does not change the irradiation while the black body will conceivably
change the radiation. Also, a black body will have an external heat transfer to or
from it to satisfy steady state, while a reradiating surface and an adiabatic
surface have no heat transfers to or from it.
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When dark energy is thrown into the mix, present observational data seem to indicate that the universe will ________
Fill in the blank(s) with correct word
What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?
A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s b. 42 cm/s c. 45 cm/s d. 35 cm/s e. 53 cm/s
Kinetic energy
A. Depends only on the mass of the object B. Depends on the speed and the mass of the object C. Depends on only the speed of the object D. Is not in this chapter