1. How fast must the skateboarder be going at the bottom of the hill in order to coast over the hill? Assume the skateboarder is not doing any work on the way up the hill to increase their speed, and assume that
friction and air resistance are negligible.

Ascientific blank must be testable and capable of being proven false?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Does current flow through or across a resistor?