<p>For engineering, Econ1 and 2 will count for your SS requirement. It will also take care of the new depth requirement (2 SS or H's in a single area).</p>
<p>And yes, unless you have AP credit, MechE's take both Chem and Phys frosh year. Check out <a href="http://www.seas.upenn.edu/meam/%5B/url%5D">http://www.seas.upenn.edu/meam/</a></p>