A wet finger is rubbed slowly around the top of a crystal glass. A beautiful note can be heard. Explain what is going on using physics

Explain that newton first law,second law and third law of motion?

Stage in which a typical star has completely stopped fusion

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull