Energy transformations are always less than 100 percent efficient because some energy is always lost as heat light electricity sound

What is the type of the reaction below? bacl2 + h2so4 → 2 hci + baso4 double replacement synthesis single replacement decomposition

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

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?