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Three identical very dense masses of $7000kg$ each are placed on the $x$ axis. One mass is at $x_{1}=$ $?140cm$, one is at the origin, and one is at $x_{2}=400cm$. What is the magnitude of the net gravitational force $F_{grav}$ on the mass at the origin due to the other two masses? Take the gravitational constant to be $G=6.67×10_{?11}N?m_{2}/kg_{2}$. Express your answer in newtons to three significant figures. Part B What is the direction of the net gravitational force on the mass at the origin due to the other two masses?

The net gravitational force on the mass at the origin due to the other two masses can be calcul