The pitch of a sound is determined primarily by its
A. duration.
B. amplitude.
C. speed.
D. frequency.
Answer: D
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What happens during the apparent retrograde motion of a planet?
A) The planet appears to move eastward with respect to the stars over a period of many nights. B) The planet moves through constellations that are not part of the zodiac. C) The planet rises in the west and sets in the east. D) The planet moves backward in its orbit around the Sun. E) The planet moves backward through the sky.
The reaction rate of a chemical reaction doubles when the temperature increases from 10
to 50
What is the activation energy?
a. 
b. 
c. 
d. 
e. 
By what factor would the total power from a black body be modified if the surface area were to decrease by a factor of two while the temperature was doubled? /span>
1.1/16 2.1/8 3.1/4 4.1 5.4 6.8 7.None of the above 8.Cannot be determined
Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet's south
pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets? a. The end magnets will move away from the center magnet. b. The magnets will not move since they are equally spaced. c. The magnets will snap together. d. None of the above would happen.