In which of the following situations is there observational evidence for significant interaction between two objects? how can you tell?

1 .a communications satellite orbits the earth.
2. a ball bounces off a wall with no change in speed.
3. a space probe travels at constant speed toward a distant star.
4. a baseball that was hit by a batter flies toward the outfield.
5. a charged particle leaves a curving track in a particle detector.

The lid of a pressure cooker forms a nearly airtight seal. steam builds up pressure and increases temperature within the pressure cooker so that food cooks faster than it does in an ordinary pot. the system is defined as the pressure cooker and the water and steam within it. if 2.0 g of water is sealed in a pressure cooker and then vaporized by heating, and 5655 j must be added as heat to completely vaporize the water, what is the change in the system’s internal energy? answer in units of j.