Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge.
B. Z has a negative charge.
C. Y has a positive charge.
D. Z has a positive charge.
E. Z is neutral (has no net charge).
Answer: D
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Three pendulums with strings of the same length and bobs of the same mass are pulled out to angles ?1, ?2, and ?3 respectively, and released. The approximation sin ? = ? holds for all three angles, with ?3>?2>?1. How do the angular frequencies of the three pendulums compare?
A.
B.
C.
D.
E.