Note to the students: The following
is a typical "Exam I" for statics. It should give you
an idea of the difficulty of the exam. Try to do the exam in 50
minutes without the aid of your book or your notes, only using
your one page of equations (no solutions to problems). For each
problem, first layout the procedure to obtain the desired solution,
then complete the problem by doing all the details. Don't forget
to draw free-body diagrams for the equilibrium problems, and to
present your result in three significant digits with proper units.
If the figures are not clear, you can find them in the book.

**Problem 1:** The window is held
open by chain *AB.* Determine the length of the chain, and
express the 50-lb force acting at *A* along the chain as
a Cartesian vector. Determine its coordinate direction angles.

**Problem 2:** The cords *BCA*
and *CD* can each support a maximum load of 100-lb. Determine
the maximum weight of the crate that can be hoisted at constant
velocity, and the angle q for equilibrium.

**Problem 3:** The 2500-N crate
is to be hoisted with constant velocity from the hold of a ship
using the cable arrangement shown. Determine the tension in each
of the three cables for equilibrium.