Three identical very dense masses of 3200 kg each are placed on the x axis. One mass is at x1 = -120 cm , one is at the origin, and one is at x2 = 440 cm . A) What is the magnitude of the net gravitational force Fgrav on the mass at the origin due to the other two masses?
Take the gravitational constant to be G = 6.67×10−11 N⋅m2/kg2 .
B) What is the direction of the net gravitational force on the mass at the origin due to the other two masses?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force