Okay I need help with this question.-_- When does an object have no kinetic energy
P. S I need the answer ASAP

In a system, when potential energy decreases, then entropy also decreases. true false

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?

The energy equivalent of the rest mass of an electron is