Radiation is the only possible means of
transfer in
a) outer space where all matter is essentially absent.
b) a hot-water heating system.
c) gases.
d) matter whose molecules are not totally free to move.
a
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Hubble's Law (also known as the Hubble-Lemaitre Law) can be restated as:
A. The mass-to-light ratio of a spiral galaxy is greater if its rotational velocity is also greater. B. The more distant a galaxy, the faster it is receding. C. The rotation curve of a galaxy is related to the amount of mass inside. D. The velocity curves of spiral galaxies only make sense if there exists a lot of unseen matter.
The frictional force, due to air resistance, acting on an object is always
A. in the direction of the object's motion. B. in the upward direction. C. greater than the net force. D. smaller than object's weight. E. in the opposite direction to the object's motion.
Why does the term "planet" have a different meaning when applied to brown dwarfs than in our solar system?
What will be an ideal response?
The Earth intercepts 1.27 × 10^17 W of radiant energy from the Sun. Suppose the Earth, of volume 1.08 × 10^21 m3, was composed of water. How long would it take for the Earth at 0°C to reach 100°C, if none of the energy was radiated or reflected back out into space?
a. 26.9 y b. 113 y c. 2.69 × 10^4 y d. 1.13 × 10^5 y e. 2.69 × 10^7 y