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I'm a physics graduate student.


2d
awarded  Good Question
Apr
3
comment Relativity of Work
If the duck is already in motion, from one perspective you do positive work and the ground does equal negative work and the duck's energy doesn't change. From another perspective you do zero work and the ground does zero work and the energy doesn't change.
Apr
3
answered Relativity of Work
Mar
31
comment Why can we ignore self energy?
Right; as long as it's continuous that integral works.
Mar
31
accepted How small does sand have to be to get wet?
Mar
31
answered Why can we ignore self energy?
Mar
31
comment Why can we ignore self energy?
It breaks my heart that someone is reading Purcell and using a bunch of $\epsilon_0$ everywhere.
Mar
29
awarded  Nice Question
Mar
27
awarded  Good Answer
Mar
27
revised How small does sand have to be to get wet?
rolled back to a previous revision
Mar
26
awarded  Notable Question
Mar
26
awarded  Good Question
Mar
26
awarded  Nice Question
Mar
26
awarded  Popular Question
Mar
25
comment How does anything move?
Good point. I decided to change it to "can become positive" because I think the mere possibility is what was motivating the question.
Mar
25
asked How small does sand have to be to get wet?
Mar
25
revised How does anything move?
added 3 characters in body
Mar
25
awarded  Nice Answer
Mar
25
comment How does anything move?
...except those higher than six, of course, so the statement in my answer assumes the function is smooth. But worry about details like that is missing the point.
Mar
25
revised How does anything move?
added 11 characters in body