5. Cicadas produce a buzzing sound that has a wavelength in air of 2.69 m If the speed of sound in air is
346 m/s. what is the frequency of the sound produced by a cicada? What is its period

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.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia