What is the displacement of a hiker who travels 3.0 km east and then 4.0 km north?
5.0 km
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One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. How long is the air column? The speed of sound in air is 343 m/s
A) 1.34 m B) 0.670 m C) 0.335 m D) 1.00 m E) 2.68 m
A stream of a certain liquid compound is attracted to an electrically charged rod. The compound is probably
a. metallic. b. nonpolar covalent. c. ionic. d. polar covalent.
The main reason ocean tides exist is that Moon's pull is stronger
A) than the pull of the Sun. B) on water closer to it than on water farther away. C) on Earth's oceans than on Earth itself. D) all of the above
Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) Galaxy 1 must be twice as big as Galaxy 2. B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2. C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2. D) Galaxy 2 must be twice as old as Galaxy 1.