A copper wire of length 5.0 m, cross sectional area 6.9 × 10^?6 m2, and Young's modulus 11 × 10^10 N/m2 has a 190-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)
a. 5.0E–3 m
b. 1.8E–2 m
c. 7.3E–3 m
d. 1.2E–2 m
e. 2.5E–2 m
d
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A chain reaction can occur
A) in any uranium core. B) when critical mass is reached. C) when critical mass is exceeded. D) in the center of the Sun. E) when the coolant is too hot.
The concentration of solid-solution atoms at a stationary edge dislocation is greater than the average concentration of solid-solution atoms in the solid, and this results in the _________yield point in low-carbon steels.
Fill in the blank(s) with the appropriate word(s).
The balloon and the magazine shown in this figure are both electrical insulators. Suppose the magazine was replaced by an uncharged metal sheet of the same size as the magazine. The balloon would:
a. be repelled by the metal sheet. b. be attracted by the metal sheet. c. be unaffected by the metal sheet. d. have all electrical effects neutralized by the presence of the metal. e. acquire the opposite charge because of the metal.
Which is the lightest particle?
A) proton B) electron C) neutron D) all about the same