What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?
A) Its surface temperature and luminosity increase.
B) Its surface temperature remains the same and its luminosity decreases.
C) Its surface temperature and luminosity decrease.
D) Its surface temperature decreases and its luminosity increases.
E) Its surface temperature and luminosity remain the same.
B
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Before it was found that when a substance burns, it is combining with oxygen, it was hypothesized that the burning material released a substance called ______________
Fill in the blank(s) with correct word
The figure shows a uniform, horizontal beam (length = 10 m, mass = 25 kg) that is pivoted at the wall, with its far end supported by a cable that makes an angle of 51° with the horizontal. If a person (mass = 60 kg) stands 3.0 m from the pivot, what is the tension in the cable?
A. 0.83 kN B. 0.30 kN C. 0.38 kN D. 0.42 kN E. 3.0 kN
The amount of heat needed to raise the temperature of 1 gram of water by 1°C is
v
In contrast to the photosphere's continuum, the spectrum of the chromosphere is dominated by ________ lines
Fill in the blank(s) with correct word