At a construction site, a helicopter is lifting two steel beams,
each with a mass of 290 kg. One steel beam is attached directly to
the helicopter by a cable. The second steel beam is not attached to
the helicopter directly, but it is instead hanging directly below
the first steal beam and attached to the first beam by another
cable. Assume the cables have no mass.
(a) If the steel beams are at rest, what is the tension in...