Askateboarder who travels 60 meters in 30 seconds has a speed of

It is may 5 and you are somewhere in the northern hemisphere. if you determine that the noon sun is 51 degrees above your southern horizon, what is the latitude of your location

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

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?