When a car's starter is in use, it draws a large current. The car'slights draw much less current. As a certain car is starting, the current through the battery is 58.2 A and the potential difference across the battery terminals is8.82 V. When only the car's lights areused, the current through the battery is 1.86 A and the terminal potential difference is10.7 V. Find the battery's emf. Find the internal resistance.