What must exist for electric charges to flow?

electric potential or electric potential difference

He force that pulls the moon toward earth is called

a rocket launched into outer space travels 2.4 times 10^5 km during the first 6 hours after launching. what was the rockets average velocity in m/s and km/hr

How to produce radio wave?

Daily summer solar radiation levels at polar latitudes are caused by the high intensity of radiation per unit surface area rather than by long periods of daylight.

What do all objects with mass produce?

According to the kinetic-molecular theory, gases condense into liquids because of

What does sound travel throu better

How does a change in resistance affect the conductivity of a material? A) The lower the resistance, the worse the conductivity B) The lower the resistance, the better the conductivity C) The higher the resistance, the better the conductivity D) The

Two railroad cars, each of mass 6500 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. how much thermal energy is produced in this collision?

What is a result of using a machine?