What determines "loudness" of a musical note?
A)
frequency
B)
wavelength
C)
velocity
D)
phase
E)
amplitude
E
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Which of the following was the most imperfect region according to Aristotle's philosophy?
A) The center of the Sun B) The heavens C) Earth's surface D) Earth's center
In a two-slit experiment, light rays from the two slits that reach the third maximum on one side of the central maximum travel distances that differ by _____.
A. 3? B. ? C. ?/3 D. 2? /3
An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 m to x = 8 m?
?
?
A. ?10 J B. +10 J C. +30 J D. ?30 J E. +40 J
About 90% of UFO sightings
A) are hoaxes B) cannot be explained C) are real sightings of alien craft D) can be explained by natural phenomena