Explain the conservation laws in the context of stellar astronomy
What will be an ideal response?
Among the four laws of stellar structure, the first two laws of stellar structure have something in common-they are both what astronomers and physicists call conservation laws. Conservation laws say that certain things cannot be created out of nothing or vanish into nothing.The law of conservation of mass is a basic law of nature that can be applied to the structure of stars. It says that the total mass of a star must equal the sum of the masses of its shells.The law of conservation of energy is another basic law of nature. It says that the amount of energy flowing out of the top of a layer in the star must be equal to the amount of energy coming in at the bottom, plus whatever energy is generated within the layer. That means that the energy leaving the surface of the star, its luminosity, must equal the sum of the energies generated in all the layers inside the star.
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The umbra of the moon's shadow is the region from which no part of the photosphere is visible
Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. Fusion power is completely safe and has no radioactive waste disposal problem. 2. The fusion reactions used in thermonuclear bombs and fusion power experiments are exactly the same as those used in the sun.
Trenches are areas where the denser oceanic plates are subducted beneath the leading edges of lighter continental ones
Indicate whether the statement is true or false
We observe that a moving charged particle experiences no magnetic force. From this we can definitely conclude that
A) no magnetic field exists in that region of space. B) the particle must be moving parallel to the magnetic field. C) the particle is moving at right angles to the magnetic field. D) either no magnetic field exists or the particle is moving parallel to the field. E) either no magnetic field exists or the particle is moving perpendicular to the field.