What mechanism explains the presence of "hot Jupiters" around many other stars?
A) evaporation of the disk by the stellar wind removes gas that was holding the planet at a large radius
B) gravitational attraction by terrestrial planets that formed at small radii attract the giant planets inward
C) rapid formation of the gas giant from evaporated rock and metal at the inner disk edge
D) planetary migration caused by gravitational interactions between the planet and disk
D
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The size of a black hole, its Schwarzschild radius, is simply proportional to its _____
A) mass B) luminosity C) temperature D) density
A charge of uniform volume density (40 nC/m3) fills a cube with 8.0-cm edges. What is the total electric flux through the surface of this cube?
A. 2.9 N ? m2/C B. 2.0 N ? m2/C C. 2.6 N ? m2/C D. 2.3 N ? m2/C E. 1.8 N ? m2/C
Which one of the following is correct for the energy of a 620 nm beam of light?
A) 1.60 × 10-19 eV B) 2.10 × 10-19 J C) 3.21 × 10-19 J D) 1.60 × 10-18 eV E) 3.21 × 10-18 eV
Linear momentum is conserved in all collisions
a. True b. False Indicate whether the statement is true or false