A group of students are trying to create a model that represents a mechanical wave. What specific properties would this wave have

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.

How can you increase the strength of an electromagnet?

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?