An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
a. 4 years
b. 8 years
c. 16 years
d. 32 years
e. 64 years
b
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Which of the following is not one of, nor a direct consequence of, Kepler's Laws?
A) The force of attraction between any two objects decreases with the square of the distance between their centers. B) As a planet moves around its orbit, it sweeps out equal areas in equal times. C) The orbit of each planet about the Sun is an ellipse with the Sun at one focus. D) More distant planets orbit the Sun at slower speeds. E) A planet or comet in a noncircular orbit travels faster when it is nearer to the Sun and slower when it is farther from the Sun.
A charge of 1.0 × 10-6 ?C is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 0.11 N ? m2/C B) 8.9 N ? m2/C C) 0.028? N ? m2/C D) It cannot be determined without knowing the radius of the sphere.
Synchrotron radiation is produced
a. in planetary nebulae. b. by red dwarfs. c. massive stars as their iron core collapses. d. in supernova remnants. e. neutrinos
The energy required to ionize a hydrogen atom whose electron is in the ground state (energy level 1 ) is:
A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.