In which system is heat usually transferred from the cooler part to the warmer part?
a. a stove as it heats up water
b. a refrigerator that is running
c. an electric fan that is running
d. none of the above, because it is impossible to transfer heat in this manner
b
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General Questions: Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing,
A. Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. B. Susan is moving away from Bill, and Bill is stationary. C. Susan and Bill are moving away from each other, with equal speeds. D. Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.
Thin Films: A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally-incident light having a wavelength of 530 nm?
A. 24.9 nm B. 76.9 nm C. 99.6 nm D. 199 nm E. 398 nm
What is the direction of 
in the wave as it passes P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD
According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 × 10?21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 × 10?27 kg) and a xenon atom (m = 2.00 × 10?25 kg). [kB = 1.38 × 10?23 J/K]
What will be an ideal response?