Part A A timber beam is loaded as shown below. If the height to width ratio for its rectangular cross section is 1.5, calculate the required width if the allowable normal stress, allow, is 7.5 MPa and the allowable shear stress, Tallow, is 600 kPa. 8 kN/m -2 m 4 m- 2 m 150 mm 268 mm 178.5 mm 300 mm Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Incorrect