In a certain binary-star system, each star has the same mass which is 3.2 times of that of the Sun, and they revolve about their center of mass. The distance between them is the 6.3 times the distance between Earth and the Sun. What is their period of revolution in years?

Aman is trying to drag a small tree that he cut down. if the static coefficient of friction of the tree on the ground is 0.5 and the tree weighs 670 n, what is the minimum amount of horizontal force that the man will need to apply so that the tree will start moving? o a. 465 n o b. 230 n o c. 670 n o d. 335 n