Plz help I don't have very much time... A man is pulling on a rope with a force of 66 N
directed at an angle of 31◦
to the horizontal.
What is the x-component of this force?
Answer in units of N.

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?

Newtons view of arrangement of the universe

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?