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long thin uniform rod lies motionless in fric free horizontalplane along y-axis. It's pinned to the ground with a friction freepivot. A force F is applied at 90deg. to the bar and at its veryend. IF the mass is 1kg and force is 2N:

a) what's initial accelerat of center of mass?
b) what force does the pin apply to the rod initally ?
c) where could this same force be applied so that the pinexertes no force initially?

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