Q. A child in danger of drowning in a river is carried downstream by a current that flows uniformly with a speed of 2.0 meters per second. The child is 200 meters from the shore and 1500 meters upstream from the wharf where the rescue team sets out. If their boat speed is 8.0 meters per second with respect to the water, at what angle should the driver leave the shore to go directly to the child?
Q. A uniform steel beam has a mass of 1800 kg. On it is resting half of an identical beam. What is the vertical support force at each end?