The mass of an electron a. equal to the mass of the proton and the neutron b. not significant to the overall mass of the atom c. higher than the mass of the proton or the neutron

Which accurately compares concave and convex lenses?

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?