The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15 × 10^7 s. What is the acceleration of the Earth in its orbit about the Sun?
a. 18.6 mi/s2
c. 13.6 × 10^-6 mi/s2
b. 9.3 × 10^-3 mi/s2
d. 3.7 × 10^-6 mi/s2
D
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The period we call the "heavy bombardment" was
A) the first few hundred thousand years of the solar system's history. B) the most recent hundred million years of the solar system's history. C) the first few hundred million years of the solar system's history. D) a period of a few hundred million years that began when the solar system was about 1 billion years old. E) the time during which an asteroid hit the Earth and caused the extinction of the dinosaurs.
Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
A. 1/4. B. 1/2. C. 1. D. 2 E. 4.
Barium-137 emits a gamma ray from an excited state (137Ba*). What is the resulting daughter nuclide?
A. 137Cs B. 137Ba C. 137La D. 136Ba E. 136Cs
A radioactive isotope that emits an alpha particle will change in what respect?
a. Atomic number decreases by four. b. Both choices a and b are valid. c. Mass number decreases by four. d. None of these choices are valid.