[填空题]
A 75-cm-long guitar string of mass 2.10 g kk-mt6u2zo7y- as8g *a i/nm kis near a tube that is opa1;lmprw:lvoev a9 /8en at one end and also 75 cm long. Howwrae:aov1 llv89mp; / much tension should be in the string if it is to produce resonance (in its fundamental mode) with the third harmonic in the tube? $ \times10^{ 2}$ N
