In a certain binary-star system, each star has the same mass which is 5.2 times of that of the sun, and they revolve about their center of mass. the distance between them is the 9.1 times the distance between earth and the sun. what is their period of revolution in years?

The answer is a 0.64 volts

Ibelieve the answer you're looking for is

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j