An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done on the plane by the air? A) -2.71 × 108 J
B) -0.985 × 108 J
C) -221 × 108 J
D) 221 × 108 J
E) 0.821 × 108 J
A
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Determine the energy stored in C1 when C1 = 10 ?F, C2 = 12 ?F, C3 = 15 ?F, and V0 = 70 V
a.
6.5 mJ
b.
5.1 mJ
c.
3.9 mJ
d.
8.0 mJ
e.
9.8 mJ
The sidereal drive of a telescope mounting must turn the telescope
a. southward about the polar axis. b. eastward about the polar axis. c. westward about the polar axis. d. northward about the polar axis. e. none of the above
The lunar maria are
a. the lava plains of the lunar lowlands. b. the smooth plateaus of the lunar highlands. c. less than one billion years old. d. moving plates of lunar crust. e. older than the lunar highlands.
When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates
A) something is faulty. B) a time delay for current attaining its average speed. C) increased temperature means increased resistance. D) nothing of interest