Atime-varying electric field is always accompanied by a: a) time-varying magnetic field b) static electric field c) charge motion d) static magnetic field

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

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.

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?