Astronomers think that the inner core of Jupiter is composed mainly of ________.
A. helium
B. rock and iron
C. uranium
D. hydrogen
E. water
Answer: B
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Suppose you measure the parallax angle for a particular star to be 0.1 arcsecond. The distance to this star is
A) 10 light-years. B) 10 parsecs. C) 0.1 light-year. D) 0.1 parsec. E) impossible to determine.
Electrons flow around a circular wire loop in a horizontal plane, in a direction that is clockwise when viewed from above. This causes a magnetic field. Inside the loop, the direction of this field is
A. toward the center of the loop. B. radially outward from the center of the loop. C. down, away from the viewer. D. up, toward the viewer.
How is a rock defined?
A nonuniform linear charge distribution given by l(x) = bx, where b is a constant, is distributed along the x axis from x = 0 to x = +L. If b = 40 nC/m2 and L = 0.20 m, what is the electric potential (relative to a potential of zero at infinity) at the point y = 2L on the y axis?
a. 19 V b. 17 V c. 21 V d. 23 V e. 14 V