According to nebular theory, the progression from planetesimal to full-fledged planet is propelled mainly by which of the following
A. nuclear fusion
B. gravity
C. heat
D. nucleosynthesis
Ans: B. gravity
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In general, how does the size and location of a star's habitable zone depend on the star's mass?
A) The smaller (less massive) the star, the larger and the closer-in the habitable zone. B) The smaller (less massive) the star, the smaller and the closer-in the habitable zone. C) The smaller (less massive) the star, the larger and the farther-out the habitable zone. D) The habitable zone is always about the same size, but its location moves inward for smaller stars.
Saturn has fewer, but stronger winds than Jupiter
a. True b. False Indicate whether the statement is true or false
A very small object carrying -6.0 ?C of charge is attracted to a large, well-anchored, positively charged object
How much kinetic energy does the negatively charged object gain if the potential difference through which it moves is 3.0 mV? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 18 nJ B) 0.50 kJ C) 0.50 J D) 6.0 ?J
Gravitational Force: Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side. If one of the balls is released, what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2)
A. 3.7 × 10-8 m/s2 B. 2.5 × 10-8 m/s2 C. 1.9 × 10-8 m/s2 D. 4.2 × 10-8 m/s2 E. 6.4 × 10-8 m/s2