Problem 1 (2+2+5 = 9 points) A 30.0-kg child sits on one end of
a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child
sits on the other end. The beam balances when a fulcrum is placed
below the beam a distance 1.10 m from the 30.0-kg child.
A. Draw a free body diagram of the beam showing all the
forces,
B. Calculate the normal force on the beam from the fulcrum
C. Using the concept of rotational equilibrium, find the length
of the beam. Explain how you solved the problem using relevant
equations, your choice of axis of rotation, and the signs of
relevant torques. If any torques are zero based on your choice of
axis, explain why.