I love tutoring physics and mathematics at the high school level. But when it comes to some of the questions here that are much more conceptual and are college level math and physics problems, I am hesitant to answer, since I might be wrong. But I still want to offer an input and try to help? Is it wrong that I want to express my point of view in a problem even though I might not have the sufficient knowledge to solve such problem? I am not very good at physics, but that is my major. Does one just get better at Physics over time? Does one ever master physics? When does one know when one has mastered a subject?