The semi-major axis, a, of an elliptical planetary orbit is equal to the
A) width of the ellipse
B) distance between the planet and the Sun at perihelion
C) average distance between the planet and the Sun
D) distance between the planets and the Sun at aphelion
C
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If an object doubles its luminosity in 10 hours, how large can the emitting source of light be?
A) about 10 light-hours across B) about 10 parsecs across C) about 10 light-years across D) varies depending on how luminous the object is E) varies depending on how far away the object is
An alpha particle (a helium nucleus, having charge +2e and mass 6.64 × 10-27 kg) moves head-on at a fixed gold nucleus (having charge +79e)
If the distance of closest approach is 2.0 × 10-10 m, what was the speed of the alpha particle when it was very far away from the gold? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.60 × 10-19 C) A) 2.3 × 105 m/s B) 4.6 × 105 m/s C) 2.3 × 106 m/s D) 4.6 × 106 m/s
The universe seems to be about how many years old?
a. 232 billion b. 6 billion c. 13.7 billion d. 1 billion
When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants.
A. 0.250 B. 0.500 C. 0.693 D. 1.00 E. 1.44