3. How does the enrollment in physical science compare
with that in chemistry over the years? Do you see any
trends?

What are two different ways you could find the value of a? explain these methods.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

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?