Claudius Ptolemy created a mathematical model of the Aristotelian Universe in which a planet followed a small circle called the _____ that slid around a larger circle called the deferent
A) heterocycle
B) epicycle
C) pericycle
D) hemicycle
B
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The diagram shown represents a portion of a wire in a circuit. A current is flowing in the wire in the direction shown. Under the convention that it is positive charge that flows the electric field points in the direction of the current. How can the electric field change direction where the wire bends?
a.
There is an excess of negative charge in the center of the wire.
b.
There is an excess of positive charge at the bottom end of the wire.
c.
There is an excess of negative charge at the right end of the upper portion of the wire.
d.
There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.
e.
There is an accumulation of electrical potential as the current traverses the wire: The higher potential in the lower half is the source of the field.
At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A) Pluto B) Neptune C) Uranus D) Jupiter E) Saturn
In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?
A) 0° B) 45° C) 90° D) 180° E) none of the given answers
Which of the following statements are true regarding electromagnetic waves traveling through a vacuum? More than one statement may be correct
1.All waves have the same wavelength. 2.All waves have the same frequency. 3.All waves travel at 3.00 × 108 m/s. 4.The electric and magnetic fields associated with the waves are perpendicular to each other and to the direction of wave propagation. 5.The speed of the waves depends on their frequency.