The type of heat transfer that occurs between a stove and a pot placed on it is
A)
convective.
B)
conductive.
C)
radiative.
D)
countercurrent.
E)
evaporation.
B
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What do the size and distribution of small scale temperature variations suggest about the geometry of the Universe?
What will be an ideal response?
The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
The following statements refer to man-made, artificial satellites in orbit around Earth. Which is an accurate statement?
A) The velocity required to keep a satellite in a given orbit depends on the mass of the satellite. B) The period of revolution of a satellite moving about the Earth is independent of the size of the orbit it travels. C) A satellite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit. D) It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit. E) Only circular orbits are possible for artificial satellites.
In our solar system, terrestrial planets are
A) small, made mostly of rock and iron with high densities, and found close to the Sun B) large, made mostly of gases and liquids with low densities, and found far from the Sun C) large, made of pure gases with low densities, and found far from the Sun D) small, made of pure rock with high densities, and found close to the Sun