On a hot day, molecules of air ________ than on a cold day.
A) move faster on average
B) move slower on average
C) are more massive
D) are less massive
E) contain more atoms
A) move faster on average
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Consider a conducting bar that is free to slide along conducting rails in an upward magnetic field as shown in the diagram below. We push the bar so that it moves to the right at a constant speed. Which way will current flow through the bar, the rails, and the light bulb?
A. Clockwise
B. Counter-clockwise
C. No current flows at all.
Suppose the distance to the Moon were twice its actual value. Could we still have solar eclipses? If so, what type(s)?
What will be an ideal response?
In going from Sa to Sc, the size of the ________ reduces significantly
Fill in the blank(s) with correct word
All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle. B. they do not operate through a reversible cycle. C. the working substance does not maintain a constant volume through the cycle. D. the working substance does not maintain a constant pressure through the cycle. E. the working substance does not maintain a constant temperature through the cycle.