In using Ampere's law, the integral must be evaluated
A) around a path that lies in a plane.
B) in a clockwise direction.
C) around a closed path.
D) around a circular path.
E) in a counter-clockwise direction.
C
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Pluto's orbit has a lower inclination to the ecliptic than any planet
Indicate whether the statement is true or false
A series circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
?
?
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
When is/was gravitational contraction an important energy-generation mechanism for the Sun?
A) only during solar minimum B) only during solar maximum C) when the Sun was being formed from a collapsing cloud of gas D) right after the Sun began fusing hydrogen in its core E) when the Sun transports radiation through the convection zone