You are out camping. As it gets dark, it starts to get cold so you light a fire. What are two energy transformations that explain the light and the heat given off by the fire?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.