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Answers to Checkups 465

3. A material with a larger bulk modulus is stiffer, that is, its 4. (A) 22 . Since the elongation is inversely proportional to the
volume shrinks less in response to an applied pressure. We can area of the elastic body [see Eq. (14.18)], if you want to
rewrite Eq. (14.20) as F A B( V V ); thus, at constant decrease the elongation of a cable by a factor of 2, you must
pressure, a B that is larger by a given factor results in a frac- increase the cross-sectional area by a factor of 2; thus, you
tional volume change that is smaller by the same factor. The must increase the diameter by a factor of 22 .
volume of the copper sphere then shrinks by 0.005%.