A workman lifts a 400-newton load of bricks by pulling down on a rope with a force F. The load is lifted with constant speed. The upper pulley is attached to the ceiling by a chain, and the lower pulley is attached to the bricks by another chain. The pulley system is illustrated below. Find the tension in each chain, T1 and T2, and the force F. Assume the masses of the rope, chains, and pulleys are negligible, as is friction.

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