Using the equation

v1 = n/2L x (T/u)1/2

Taking n = 1 and subsituting u = m/L, where m is the total mass.
Solving for T we get

T = 4mLv12

= 4(1.25 X 10-4)(0.33)(6.4 x 102)2

= 68 N

or about 15 lb of tension is required.

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