A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?
A) 10 kg ? m/s B) 6.0 kg ? m/s C) 8.0 kg ? m/s D) 2.0 kg ? m/s E) 14 kg ? m/s
A
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The key point to remember when considering the Hertzsprung-Russell (H-R) diagram of a star cluster in determining the evolution of stars is that all of the stars in the star cluster have the same:
A) temperature but differ in luminosity. B) age but differ in mass. C) size but differ in composition. D) shape but differ in transparency.
The materials that made up the solar nebula can be categorized into the four general types as follows. Rank these materials from left to right based on their abundance in the solar nebula, from highest to lowest.
Saturn is about 10 times as far from the Sun as Earth is (a = 10 AU, roughly). About how many times does Earth orbit the Sun in the time it takes Saturn to orbit just once? Remember P2 is proportional to a3.
A. 12 B. 0.5 C. 60 D. 32 E. 1
The seven days of the week are related to the
A) Sun, Moon and five naked eye planets B) seven brightest stars in the sky C) seven planets known at the end of the 19th century D) seven most prominent constellations that the Sun, Moon and planets pass through