Undergraduates would take at least 4 courses per quarter. At a semester school, it would be 4 or 5 standard.
Many physics programs have a significant amount of computation in them. Enough to get you a job in software easily. As an example the physics curriculum at my university, Illinois Tech, includes a basic programming course in CS and then two computational physics courses where students use MatLab and Python. This, along with a relatively deep understanding of physical modeling, will be a good background to get a job in these fields. An economics minor is not really needed.