Question: Four masses A, B, C and D revolve at equal radii and are equally spaced along a shaft. The mass B is 7 kg and

Four masses A, B, C and D revolve at equal radii and are equally spaced along a shaft. The mass B is 7 kg and the radii of C and D make angles of 90° and 240° respectively with the radius of B. Find the magnitude of the masses A, C and D and the angular position of A so that the system may be completely balanced.

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