Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?

A. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface.
B. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface.
C. Angela, because the inner circumference does not change, but the outer circumference expands.
D. Clarissa, because the inner circumference does not change, but the outer circumference expands.
E. Neither, because both the inner and outer circumferences increase in length.


Answer: E

Physics & Space Science

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Coulomb's Law: A point charge Q = -12 ?C, and two other charges q2 and q2, are placed on x-y axes as shown in the figure. The electric force components on charge Q are Fx = +0.005 N and Fy = -0.003 N. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 .C(a) How many excess electrons are there in charge Q?(b) What are the charges q1 and q2, including their signs?

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