Heat escapes from a planet's surface into space by thermal radiation. Planets radiate almost entirely in the wavelength range of the
A) infrared.
B) radio.
C) visible.
D) ultraviolet.
E) none of the above
A
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For motion in a straight line under constant acceleration in the x-direction, which of the following determines the positive directions for displacement, velocity, and acceleration?
1.Each of the listed quantities may have its positive direction chosen independently of each other. 2.the initial velocity 3.the positive direction of the x-axis 4.the initial acceleration
Glaciers flow downslope. A glacier moves fastest
A) when it begins to melt. B) at its surface and in the center. C) at its base and along its sides. D) when ablation exceeds accumulation.
What characteristic do all stars on the main sequence share?
A. They are all fusing hydrogen into helium in their cores. B. They all have the same temperature. C. They all have the same luminosity. D. They will all go through a helium flash in the future. E. They all have the same size.
Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs
A) with a hotter flame. B) for a shorter time. C) for a longer time. D) all of the above E) none of the above