Could you answer these questions in a maximum of two paragraphs each question and with a practical example for each answer?

1. What are the sources of a court's authority?

2. How does a court obtain personal jurisdiction over the plaintiff and defendant?

3. How is a cause of action different from a claim?

4. How can an established rule of law be overturned?

5. What jurisdictional issues must a court consider to determine if it is competent in a specific case?