Which concept was NOT a part of Kepler's Laws of Planetary Motion?
A) All planetary orbits are ellipses.
B) The square of the planet's period is equal to the cube of its average distance.
C) A planet must move fastest in its orbit at perihelion.
D) Epicycles are needed to explain the varying brightnesses of the planets.
D
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In diagrams of magnetic fields, the symbol
is used to represent
A. the region of no magnetic field. B. the north magnetic field. C. the magnetic field coming out of the paper. D. the magnetic field going into the paper. E. the magnetic field.
The critical fiber length divided by the fiber _________is equal to the critical aspect ratio.
Fill in the blank(s) with the appropriate word(s).
What do we call the swarm of comet nuclei in a huge shell surrounding the Sun and planets?
A. the Oort cloud B. the Solar System C. the ecliptic D. the Asteroid belt
For an ohmic conductor, current is
a. directly proportional to voltage. b. directly proportional to resistance. c. independent of resistance. d. independent of voltage.