The cross section of a beam is shown in Fig. 10.57(a). Its $I_{x x}$ is equal to $3 x 10^{6} m m^{4}$ . It is subjected to a load as

shown in Fig. 10.57(b).

The maximum tensile stress in the beam would be

- 1
  
  indeterminable as data is insufficient
- 2
  
  $21 M N / m^{2}$
- 3
  
  $21 K N / m^{2}$
- 4
  
  $21 N / m^{2}$

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