(a)
The mass of the asteroid Electra.
(a)

Answer to Problem 38QP
The mass of the asteroid Electra is
Explanation of Solution
Write the expression for the Kepler’s law for the time period of a celestial body around the planet.
Rearrange the above expression for the mass of the planet.
Here,
Conclusion:
Substitute
Thus, the mass of the asteroid Electra is
(b)
The density of the asteroid Electra.
(b)

Answer to Problem 38QP
The density of the asteroid Electra is
Explanation of Solution
Write the expression for the density of the asteroid Electra.
Here,
Write the expression for the volume of the asteroid.
Here,
The diameter of the asteroid is
Conclusion:
Substitute
Substitute
Thus, the density of the asteroid Electra is
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Chapter 12 Solutions
21st Century Astronomy
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