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The shear stress at the neutral axis in a beam of triangular section with a base of 40 mm and height 20 mm, subjected to a shear force of 3 kN is
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- 3 MPa
- 6 MPa
- 10 MPa
- 20 MPa
Correct Option: C
| b = 40 × | = | mm (by symmetry) | ||
| 3 | 3 |
∴ Area of upper triangle
| = | × | × | ||||
| 2 | 3 | 3 |
| = | mm2 | 9 |
| y = | × | = | mm | |||
| 3 | 3 | 9 |
| τnetutral axis = | l.b |
= 10 N/mm2 = 10 mPa.
