Assume that the clamp shown has been tightened on wooden planks being glued together until P = 300 N. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. P P' 50 mm La Determine the stress at point D in section a-a. The stress at point D is - MPa. 10 mm 4 mm A B 20 mm Section a-a D k 4 mm