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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A) 0 J B) 20 J C) 200 J D) 1000 J E) None of the other choices is correct.
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of __________
Fill in the blank(s) with correct word
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.
to answer this question.D.
E.