Weight can be simulated in a space vehicle if the vehicle is
A) falling.
B) in a circular orbit about Earth.
C) rotating.
D) none of the above
Answer: C
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Energy Density: An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 2.3 × 10-13 J/m3 B. 3.3 × 10-13 J/m3 C. 4.7 × 10-13 J/m3 D. 6.6 × 10-13 J/m3 E. 9.4 × 10-13 J/m3
On average, the highest amounts of precipitation occur in this zone.
A freely-falling watermelon falls with constant
A) velocity. B) speed. C) acceleration. D) distances each successive second.
Meteors in outer space keep moving, rather than slowing down and stopping. This behavior is predicted by
A) Galileo's law of falling. B) the law of force pairs. C) Aristotle's principle of natural motion. D) the law of inertia. E) Newton's law of motion.