(ii) The wave travels from the rock into the air State and explain whether the wave will be audible to a healthy human ear.
statement
explanation

In science and physics what is the standard unit of measure for speed?

Give an example in which the electrical energy changes to light energy

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?