4. value: 10.00 points The beam shown is made of a nylon for which the allowable stress is 24 MPa in tension and 30.5 MPa in compression. Determine the largest couple M that can be applied to the beam if d = 40 mm. (Round the final answer to one decimal place.) 40 mm - 15 mm 20 mm M The largest couple M that can be applied to the beam is N-m.