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just wondering if you could help me out?

For a standard rectangular cross-section cantilever beam with a concentrated end load how do i work out the top surface stress at a point along the beam? do i just use sigma=My/I where y=half the depth of the beam and M=end load * distance from end load to point of interest ...?

This sounds right but i'm not certain..sorry, hope this is easy enough to answer.

thanks a lot!

Ralph