Explain why the air over land is warmer during the day than the air over water

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?