Which mechanism does it least effectively suppress?
A. Conduction
B. Convection
C. Radiation
A. Conduction
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The verdict at the end of the Extraordinary Claims box says “Likely correct, though may never be possible to prove definitively.” In the context of models, which of the following best explains this verdict?
a. A model that precisely reproduces major characteristics of the Moon would seem likely correct, but we can’t go back in time to see that it actually happened that way. b. Models are not reality, and we can never trust their results to reflect what might happen in the real world (or universe). c. No model could ever be good enough to reproduce the major characteristics of the Moon. d. Models are very vague, and cannot be used to make mathematically precise predictions.
Circular Motion of Charges: A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been
A. 2R. B. 4R. C. 8R. D. R/2. E. R/4.
Graphical Analysis: The motion of a particle is described in the velocity vs. time graph shown in the figure. 
Over the nine-second interval shown, we can say that the speed of the particle
A. only increases. B. only decreases. C. increases and then decreases. D. decreases and then increases. E. remains constant.
If the Sun collapsed to a black hole, Earth's speed in space would
A) increase. B) decrease. C) remain the same.