The time for one complete cycle of a periodic process to take place is called the __________
Fill in the blank(s) with correct word
period
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On average, a body 100 meters in diameter or larger impacts Earth every ________ years.
A. 10 million B. 100,000 C. 1,000 D. 10,000 E. one million
Much of Europa's surface appears chaotic and clogged with huge iceberg-like blocks. This is consistent with
A) a thin icy crust that has been broken into pieces by tidal forces below which is a subsurface ocean of water B) the surface thawing due to heat emitted by Jupiter C) the breaking up of the surface due to plate tectonics D) a giant impact that has recently shattered the crust into pieces
A proton is circling the Earth above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 × 10^–8 T. If the proton is moving at a speed of 2.7 × 10^7 m/s, how far above the surface of the Earth is the proton? Earth's radius is 6.38 × 10^6 m, a proton's mass is 1.67 × 10^–27 kg, and its charge is 1.6 × 10^–19 C
a. 7.05E+6 m b. 1.34E+7 m c. 1.03E+8 m d. 6.65E+5 m
Imagine that we place a positively charged particle a distance r from a neutral atom, as shown below. Choose your answers for parts b through e from figure E2.12. 
The electric field of the charged particle causes the initially neutral atom to become charged.
A. A B. B C. C D. D E. Zero F. Other G. AA H. BB I. CC J. DD