Deduce the equation for position - velocity relation

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?