Which of the following best represents the energy transformations occurring in a solar-heated power plant?
A) chemical ? thermal ? electric
B) electric ? thermal ? electric
C) thermal ? radiant ? electric
D) electric ? thermal ? radiant
E) radiant ? thermal ? electric
E
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As viewed by us here on Earth, where does time run slowest?
A) the surface of a white dwarf B) the surface of the Sun C) the surface of the Earth D) the top of Mount Everest on Earth E) in empty space
Two objects, a ring and a disk, both with equal mass and radii. Each is rotating about an axis through its center, as shown. Which has the greatest rotational inertia, I, a uniform disk or a ring?
A. They have the same I, since they both have the same mass and radius
B. The disk
C. The ring
A barge is 10 m wide and 60 m long and has vertical sides. The bottom of the boat is 1.2 m below the water surface
What is the weight of the barge and its cargo (force exerted on them by Earth), if it is floating in fresh water of density 1000 kg/m3? A) 3.5 MN B) 6.4 MN C) 6.8 MN D) 7.1 MN E) 9.5 MN
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.
E.
b.
F.
c.
G.
d.
H.
e.
A.