Which of the following statements correctly compares the terrestrial planets?
A. Earth is the only planet that has active plate tectonics and surface water.
B. Venus has the densest atmosphere and the highest average temperature.
C. Mercury is the planet with the thinnest atmosphere and the smallest size.
D. All of these choices are correct.
Answer: D
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In a ferromagnetic material, regions of parallel unpaired electron spin are magnetic _________.
Fill in the blank(s) with the appropriate word(s).
A billiard ball is moving in the x direction at 40.0 cm/s and strikes another billiard ball moving in the y direction at 30.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0 c. some negative value b. some positive value d. No answer above is correct.
Which of these events is NOT possible?
A) low-mass stars swelling up to produce planetary nebulae B) red giants exploding as Type II supernovae C) close binary stars producing recurrent novae explosions D) white dwarfs and companion stars producing recurrent Type I supernova events E) a white dwarf being found in the center of a planetary nebula
An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s2 and there is no air. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom
If the time is 6.3 s, what is the depth of the crater? A) 10 m B) 14 m C) 26 m D) 32 m E) 38 m