What are the mechanisms that restrict the mass range of stars to about 0.1 to 100 solar masses?
What will be an ideal response?
The low end is set by the resistance to gravitational contraction provided by degeneracy pressure. Stars less than about 0.1 (actually 0.08 ) solar masses do not have enough gravity to compress their cores to high enough temperatures to begin nuclear fusion. The high end is set by radiation pressure: stars more massive than 1-200 solar masses produce so much light that they blow off their outer atmospheres. More mass cannot, therefore, be sustained.
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The outward pressure of hot gas in the Sun:
A) is balanced by the inward gravitational pressure. B) is increasing the Sun's diameter. C) is cooling the photosphere. D) is responsible for variations in the sunspot cycle. E) weakens the magnetic field.
What is the MOST important role that proteins play in living organisms on Earth?
A) basic functioning of living organisms B) short-term energy storage C) information storage D) long-term energy storage and cell structure
Add the following lengths, each obtained from a different measuring instrument, and round off the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?
An ac signal of a certain frequency is applied to a capacitor. The current leads the voltage by 90°
Indicate whether the statement is true or false