Communications and weather satellites always appear at the same place in the sky because these satellites are
A) beyond the pull of Earth's gravitational field.
B) moving at a speed just short of escape velocity.
C) orbiting Earth with a 24-hour period.
D) stationary in space.
E) none of the above
Answer: C
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A 10 kg ball weighs 98 N in air and weighs 75 N when submerged in water. The buoyant force of the water on the ball is
A. 32 N. B. 30 N. C. 24 N. D. 23 N. E. 19 N.
Why is the regolith light-colored in the highlands, while darker in the maria?
A. The highland regions receive more sunlight than the maria. B. The highland regolith is younger, and therefore lighter in color. C. Lunar regolith is the same color everywhere, but the maria reflect less light. D. The regolith in the maria has a different mineral composition.
A 4.00 kg mass is moving at 4.00 m/s 45.0 degrees NORTH of WEST and a 6.00 kg mass is moving at 3.00 m/s 30.0 degrees SOUTH of EAST . The velocity of the center of mass is (a), and the velocity NORTH of the center of mass is (b)
A. a = 0.430 m/s, b = 2.30 m/s. B. a = 1.23 m/s, b = 0.230 m/s. C. a = 0.430 m/s, b = 0.203 m/s. D. a = 1.73 m/s, b = 1.43 m/s. E. a = 0.430 m/s, b = 0.230 m/s.
The planets all orbit in the same direction around the sun.
Indicate whether the statement is true or false.