calculating d /dt

samedi 1 février 2014

we were calculating $$\frac{d<p>}{dt}$$ in class and here are my class notes (sorry for the messiness):



http://ift.tt/1i6UCD4



why/how does the term circled in green go to zero??..



here is a separate note when i attempted the same problem..



http://ift.tt/1cIYvOg



where did i go wrong?





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