Which statement correctly describes protons? they have no charge and are present in the nucleus of an atom. they have a negative charge and travel around the nucleus of an atom. they have a positive charge and travel around the nucleus of an atom. they have a positive charge and are present in the nucleus of an atom along with the neutrons. nextreset

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?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!

What are the north and south poles of a solenoid change with?