Describe the three sources of internal heat of the terrestrial planets?
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Accretion is heat generated by the agglomeration of planetesimals when the planet was formed. Differentiation is heat generated by the energy released as dense objects fall toward the center of a planet during the formation of the core of a planet. Radioactive decay generates heat by releasing nuclear energy when an unstable (radioactive) isotope decays into a more stable element.
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The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax
How many kilometers is this star from Earth? A) 1.2 × 1017 km B) 1.2 × 1014 km C) 1.2 × 1020 km D) 1.2 × 1011 km
A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 46° with the normal. Find the angle of the refracted ray within the glass with respect to the normal
a. 25° c. 29° b. 56° d. 16°
Discuss how Harlow Shapley determined the structure of the Milky Way galaxy from his study of globular clusters
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A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of 6000 km [one Earth-radius] above Earth, its weight is
A) zero. B) 25,000 newtons. C) 50,000 newtons. D) 400,000 newtons. E) 100,000 newtons.