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
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A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse. B) Mars and Jupiter. C) the Moon in its monthly cycle. D) Jupiter and Saturn. E) Mercury and Venus.
Which will cool faster when removed from a furnace?
A) iron B) silver C) the same
You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this?
A) The moisture on your skin has good thermal conductivity. B) Water has a relatively large heat capacity. C) This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated. D) The water on your skin is colder than the surrounding air. E) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body.
A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on Earth?
A) 4.40 y B) 5.15 y C) 5.38 y D) 3.23 y