If the height of the ramp is increased then the marble's speed will be greater because gravity will have less resistance when pulling the marble to the ground. what is the dependent variable? question 4 options: marble's speed height of ramp gravity resistance

Explain why electric current cannot exist if a current doesn't have a voltage source.

What is the role of lenses in microscopy?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up