The free-fall acceleration on Planet A is one-sixth what it is on Planet B, and the radius of the Planet A is one-fourth that of Planet B. The mass of Planet A is what fraction of the mass of Planet B?
A) 1/6
B) 1/16
C) 1/24
D) 1/96
E) 1/12
D
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____ are believed to have formed on Mercury when the planet's interior cooled and shrank
a. Jumbled terrain b. The highlands c. Maria d. Lobate scarps e. Sinuous rilles
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) 9.4 × 10-13 J/m3 C) 4.7 × 10-13 J/m3 D) 3.3 × 10-13 J/m3 E) 6.6 × 10-13 J/m3
Monitoring comments on a website is considered wrong.
Answer the following statement true (T) or false (F)
Which statement about Pluto's discovery is FALSE?
A) It was predicted by Percival Lowell, based on perturbation theory. B) It was discovered by Clyde Tombaugh close to Lowell's predicted position. C) It was found in 1930, the first planet found by an American. D) It was the massive jovian Lowell described as "Planet X" in his calculations. E) Cold and dark, it was named for the god of the underworld.