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
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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?
What will be an ideal response?
Suppose two stars are identical except that one is twice as far away from us as the other. Which statement is true?
A) Both stars have the same apparent brightness, but the luminosity of the closer star is four times as great as that of the more distant star. B) Both stars have the same luminosity, but the apparent brightness of the closer star is twice as great as that of the more distant star. C) Both stars have the same luminosity, but the apparent brightness of the more distant star is four times as great as that of the closer star. D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.
The mass of a cubic meter of water is
A) 1 kg. B) 10 kg. C) 100 kg. D) 1000 kg. E) 9800 N.
Which unit represents the most energy?
A) calorie B) Calorie C) joule D) all the same