Ancient astronomers called the brightest stars in a constellation sixth-magnitude stars
Indicate whether the statement is true or false
False
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Kepler's second law of planetary motion is known as the law of
a. ellipses. b. equal areas. c. harmonic periods. d. gravitation.
Fewer than 100 stars lie within 5 parsecs of the Sun
Indicate whether the statement is true or false
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
Two particles, each of charge 2.5 × 10^–19 C, are 4.8 × 10^–5 m apart. What is the change in potential energy if they are brought 2.4 × 10^–5 m closer together? (ke = 8.99 × 10^9 N·m2/C2)
a. 1.2E–23 J b. 4.7E–24 J c. 2.3E–16 J d. 1.4E–15 J e. 2.9E–20 J