n a binary-star system, each star has the same mass which is 9times that of the Sun, and they revolve about theircommon center of mass. The distance between the stars is 6 times the distance between the Earth and the Sun. Whatis their period of revolution in Earth years

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.