The elliptical galaxies have compositions and shapes like the ________ of the Milky Way

Fill in the blank(s) with correct word


halo

Physics & Space Science

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Astronomers have found the black hole at the center of the Milky Way has a mass of about ________ solar masses.

A. 4 hundred thousand B. 4 million C. 4 billion D. 40

Physics & Space Science

An isolated air-filled parallel-plate capacitor that is no longer connected to anything has been charged up to Q = 2.9 nC

The separation between the plates initially is 1.20 mm, and for this separation the capacitance is 31 pF. Calculate the work that must be done to pull the plates apart until their separation becomes 5.30 mm, if the charge on the plates remains constant. (?0 = 8.85 × 10-12 C2/N ? m2)

Physics & Space Science

Given that the above energy profiles have the same scale, which of the reactions is the most exothermic?

A) a B) b C) c D) d E) none of the above

Physics & Space Science

If you compare two stars,

a. the one with the larger radius will always have the greater luminosity. b. the one with the higher surface temperature will always have the greater luminosity. c. the one with the smaller absolute magnitude will always have the greater luminosity. d. the one with the larger surface area has the greater energy flux from its surface.

Physics & Space Science