What is an electromagnet? a. a solenoid with a ferromagnetic core b. a magnet that's electrically pulsed c. a solenoid with no core d. all of the above e. none of the above

Although light from the sun appears white, it is actually made up of a lot of different colors. this portion of the electromagnetic spectrum, we call white light is referred to as within the electromagnetic spectrum.

What are igneous intrusions and extrusions

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?