"You observe a binary star system made of star A and star B with an average separation of 6 au and a period of 3 years. Suppose star A is 2 au from the center of mass and star B is 4 au away from the center of mass. What is the mass of star A in solar masses

Aball is thrown straight up into the air with a speed of 21 m/s. if the ball has a mass of 0.1 kg, how high does the ball go? acceleration due to gravity is g = 9.8 m/s^2. a. 22.5 m b. 20.0 m c. 25.0 m d. 17.5 m

Which one of the following research methods can show cause and effect

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.