The earliest and most influential Greek philosopher was Aristotle, who among many contributions taught that
A) the four elements are earth, water, air, and fire.
B) all motion is either natural or violent.
C) violent motion requires a sustained push or pull.
D) all of the above
Answer: D
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A parallel plate capacitor has air in between the plates, which are circular with radius 0.07 m. The separation gap is 0.375 mm. What is the maximum energy that can be stored in this capacitor if air-breakdown is to be avoided? The breakdown threshold field is approximately 
a. 
b. 
c. 
d. 
Neptune circles the Sun at a distance of 4.50 × 1012 m once every 164 years. Saturn circles the Sun at a distance of 1.43 x 1012 m. What is the orbital period of Saturn?
A) 304 y B) 121 y C) 109 h D) 88.6 y E) 29.4 y
1 If the person shown here on the ground is in an inertial reference system, his friends in the van moving by at constant velocity are also in an inertial reference system. True False
Indicate whether the statement is true or false