What is the angular momentum of the Moon about the Earth? The mass of the Moon is 7.35 × 1022 kg, the center-to-center separation of the Earth and the Moon is 3.84 × 105 km, and the orbital period of the Moon is 27.3 days. Ignore the small offset of the center of mass of the system from the center of the Earth in your calculation.
What will be an ideal response?
2.89 × 1034 kg?m2/s
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Which of the following best describes the goal of SETI (Search for Extraterrestrial Intelligence)?
A) to detect signals originating from civilizations from outside the solar system B) to detect life of any kind, anywhere besides Earth C) to estimate the number of civilizations in the galaxy D) to find habitable planets around other stars
Astronomers can detect the spin rates of stars by
A) their temperature. B) changes in temperature. C) absorption spectra. D) the Doppler effect. E) all of the above
The chemical properties of matter are due mostly to their
A) protons. B) electrons. C) neutrons.
In a neutron star, the core is
A) primarily iron and silicon. B) electrons and protons packed so tightly they are in contact. C) made of compressed neutrons in contact with each other. D) no longer rotating. E) constantly expanding and contracting.