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.
to answer this question.D.
E.
According to the Pauli Exclusion Principle for n = 4, the occupation limit of electrons is:
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity of 2 m/s. What is the work done by this person?
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