A pencil has
A. no nuclei in it.
B. no electric charges in it.
C. enough positive charge in the nuclei to balance the negative charge of the electrons.
D. electrons that are not attracted to nuclei.
Answer: C
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A. 1/2 B. 1/4 C. 1/8 D. 1/16
The emissivity of an ideal reflector has which of the following values?
a. 0 c. 100 b. 1 d. infinity
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A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
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