A binary star has a mass of three times the mass of the second, so if the parallax angle is (“p = 0.37) and the angular dimension of the two stars (a = 7.57 °). Find the mass of each star in terms of the mass of the Sun, knowing that the rotational time of the star is (p = 50 yr).​

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.