The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Bell effect.
B) the Mach effect.
C) the Doppler effect.
D) interference.
E) diffraction.
C
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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.
An object in a closed orbit under the influence of an attractive force that follows the inverse square law must behave a(n) _______________ path
Fill in the blank(s) with correct word
An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The net force on this auto is
A) 200 newtons backward. B) 1000 newtons forward. C) 800 newtons backward. D) 1200 newtons forward. E) 800 newtons forward.
The Hubble Telescope gets much clearer images of astronomical objects than ground-based telescopes because it has a much larger mirror than ground-based telescopes.
Answer the following statement true (T) or false (F)