[填空题]
A 75-cm-long guitar string of mass 2.10ic10gb2y5s.(gzk; 0t mu emg d g is q+ui( ex)/vs inear a tube that is open at one end and also 75 cm longsqex +)/ (uvii. How 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
