Concept explainers
(a)
The average density of the
Answer to Problem 30Q
The density of the
Explanation of Solution
Given:
Formula used:
Density of a material can be determined by the formula,
Volume of a sphere is given by the formula,
Where;
Calculation:
Conclusion:
The density of the white dwarf having the same radius as Earth is
(b)
To check: Whether the density of one teaspoon full of
Answer to Problem 30Q
The mass of one teaspoon of the white dwarf matter is about
Explanation of Solution
Given:
Formula used:
Mass of a material can be determined by the formula,
Calculation:
Conclusion:
The mass of one teaspoon of the white dwarf matter is about
(c)
Speed required for a gas to escape the surface of the white dwarf.
Answer to Problem 30Q
The speed required to eject a gas from the surface of the white dwarf is
Explanation of Solution
Given data:
Let
Formula used:
Escape speed is given by the formula,
Where;
Calculation:
Conclusion:
The speed required to eject a gas from the surface of the white dwarf is
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Chapter 20 Solutions
Universe: Stars And Galaxies
- Say that a particular white dwarf has the mass of the Sun but the radius of Earth. What is the acceleration of gravity at the surface of the white dwarf? How much greater is this than g at the surface of Earth? What would you weigh at the surface of the white dwarf (again granting us the dubious notion that you could survive there)?arrow_forwardLook at the list of the nearest stars in Appendix I. Would you expect any of these to become supernovae? Why or why not?arrow_forwardA supernova can eject material at a velocity of 10,000 km/s. How long would it take a supernova remnant to expand to a radius of 1 AU? How long would it take to expand to a radius of 1 light-years? Assume that the expansion velocity remains constant and use the relationship: expansiontime=distanceexpansionvelocity .arrow_forward
- If a visual binary system were to have two equal-mass stars, how would they be located relative to the center of the mass of the system? What would you observe as you watched these stars as they orbited the center of mass, assuming very circular orbits, and assuming the orbit was face on to your view?arrow_forwardHow would the spectra of a type II supernova be different from a type Ia supernova? Hint: Consider the characteristics of the objects that are their source.arrow_forwardBased on the problem attached, what is the answer for sub-item (b) if the radius of the neutron star is 67.004 km? (express your answer in the proper SI unit and without scientific notation)arrow_forward
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