Calculating the thickness of a 35-meter steel bridge to prevent deflection is complex, as achieving zero deflection would require infinite thickness. The discussion emphasizes the need for a clearer problem statement, particularly if this is for educational purposes. For real-world applications, obtaining a mechanical engineering degree and working with a licensed engineering firm is essential. Participants suggest posting in a dedicated forum for homework help if the inquiry is academic. The thread concludes with a note that it is closed until further clarification is provided.