In its simplest form, the theory of Terrestrial protoplanet growth supposes that:
A) all the planetesimals in each orbital zone had about the same gravitational pull.
B) all the planetesimals in each orbital zone had about the same chemical composition.
C) all the planets formed in rotating disks of gas and dust around young stars.
D) all the planets of our Solar System formed as the Sun condensed from the interstellar medium.
B
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What fraction of a radioactive sample has decayed after two half-lives have elapsed?
1.1/8 2.3/4 3.7/8 4.none of these
The Moon has an angular diameter of 0.5°. What is the Moon's angular diameter in minutes of arc?
a. 0.5 b. 30 c. 50 d. 1800 e. 60.5
The most accurate Greek attempt to explain planetary motion was the model of
A) Aristotle. B) Pythagoras. C) Hipparchus. D) Ptolemy. E) Erastothenes.
A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is exerted on the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N