The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
A
b.
B.
c.
C.
d.
D.
e.
E.
e
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When we say an appliance "uses up electricity," we mean
A) current disappears. B) electric charges are dissipated. C) voltage is lowered. D) electric energy dissipates into heat.
Consider a sample of water at 6°C. If the temperature is slightly increased, the volume of water
1) increases. 2) decreases. 3) remains unchanged. Suppose the water is cooled instead to 3°C. Then further cooling of it will cause its volume to 4) increase. 5) decrease. 6) remain unchanged.
Via the rotation curve method, we can estimate the mass of galaxies like M31 from
a. Doppler shifts of material at the edge of its disk and computing P = 2?r/v. b. the distances of the Doppler shift points from its center. c. Doppler shifts of material at the edge of its disk and computing P = 2?r/v and the distances of the Doppler shift points from its center. d. It is impossible to estimate the mass of M31.
Liquid metallic hydrogen is found in the interior(s) of
a. Uranus. b. Neptune. c. Uranus and Neptune. d. neither Uranus nor Neptune.