Not too easy. Not too difficult.
I would recommend this class because its very laid back and open as far as lecture is concerned. The concepts are pretty much common sense. I'd recommend some sort of physics before taking the class. It'll make it that much easier.
The simplest concept I've learned from this class would be the equilibrium equations. You pretty much use it the entire semester which makes the class easy in some aspects. Some real world apps are used too which can help you better understand topics.
Hours per week:
Advice for students:
Do the bonus assignments, they're simple and easy points. Also make sure you've taken some sort of physics. It will make the concepts understandable and less confusing.