ASAP NEED HELP PLEASE

A - 4.33 * 10 ^ - 6 C charge is 0.525 m from a -7.81 * 10 ^ - 4 C charge. What is their electric potential energy? ( include + or - ) ( unit J )

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question