The ________ a period ________, that coincides with ________.
A. magnetic cycle is; of 22 years; a period of intense solar and earthquakes
B. sunspot cycle is; of 11 years; the Sun's rotation around its axis
C. Maunder Minimum is; of low sunspot activity; the "little ice age" in the late 17th century
D. solar cycle is; of high sunspot activity; the cycle of the planetary alignments
Answer: C
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Applying Newton's version of Kepler's third law (or the orbital velocity law) to the a star orbiting 40,000 light-years from the center of the Milky Way galaxy allows us to determine
A) the mass of the Milky Way Galaxy that lies within 40,000 light-years of the galactic center. B) the total mass of the entire Milky Way Galaxy. C) the mass of the black hole thought to reside in the center of the galaxy. D) the percentage of the galaxy's mass that is made of dark matter.
An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity
Which statement about this conductor is true? (There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
When 1.0-µC point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 µN. What is the magnitude of the second charge? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
You can exert more force on the pedals of a bicycle if you pull up on the handlebars because
1) your center of gravity can be shifted to a position directly above the pedals, 2) the handlebars, in turn, pull down on you and this force is transmitted to the pedals, 3) rotational inertia is lessened, 4) rotational inertia is increased, all of which illustrates 5) that equilibrium is center-of-gravity dependent. 6) the law of action and reaction. 7) inertia may be both linear and rotational.