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Chapter 27 - 27.30

v eﬀ . The connection with v eﬀ is indicated in part (b) of Sample Problem 27-

5, which c ontains useful insight regarding the pr oblem we are working now. According to Chapter 20,

v eﬀ ∝

∝

τ − 1

∝

√ T . Thus, we may conclude that ρ

∝

√ T .

30. From Eq. 27-20, ρ