Gravitational lensing of distant, faint irregular galaxies may be the key to:
A) mapping the dark matter.
B) quasar energy production.
C) understanding galactic rotation curves.
D) understanding active galactic nuclei.
E) determining galactic redshifts.
A
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Why do models suggest that Uranus and Neptune formed elsewhere?
A) We do not have very good models. B) The density of materials was too low in their current orbits for the ice giants to have formed there. C) Jupiter and Saturn took up most of the material in the area; Uranus and Neptune must have formed elsewhere. D) It is too cold at their current locations for the ice giants to have formed there.
A main difference between a radio wave and a sound wave is
A) frequency. B) wavelength. C) energy. D) amplitude. E) medium or no medium.
In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from very very far away with no initial speed, and neglect the effect of the sun
What was their speed when they neared Jupiter's surface at a distance of 71.4 × 106 m from its center? Jupiter has a mass of 1.90 × 1027 kg, and G = 6.67 × 10-11 N ? m2/kg2. A) 10,400 m/s B) 11,200 m/s C) 35,500 m/s D) 42,100 m/s E) 59,600 m/s
A 900-N person is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's exert on the snow due to his interaction with Earth?
A) 0.18 N/m2 B) 0.36 N/m2 C) 1800 N/m2 D) 3600 N/m2