In a certain binary-star system, each star has the a mass of 1.20 1030 kg, and they revolve about their center of mass. The distance between them is 2.0 108 km. What is their period of revolution in Earth years?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.