The very large size of Olympus Mons indicates that Mars has ____
a. plate tectonics
b. no plate tectonics
c. a thick atmosphere
d. a molten core
e. a very active surface
b
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The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that
A) galaxy formation and supermassive black hole formation must be related. B) the black hole will eventually suck in the rest of the galaxy. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
A hydraulic lift is designed with an output cylinder that has 36 X the area of the input cylinder. If a force F is applied to the input cylinder, the output cylinder can supply a force equal to _______.
A. 1/6 F B. 1/36 F C. 6 F D. 36 F
A 2.00 m by 3.00 m plate of aluminum has a mass of 324 kg. What is the thickness of the plate? (The density of aluminum is 2.70 × 10^3 kg/m3.)
A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 60 m. A time interval of 84 s on the spaceship would be measured by the observer to be which of the following?
a. 50.4 s b. 30.2 s c. 134 s d. 140 s e. 84 s