A large crate weighing 4500 N rests on four 12-cm-high blocks on a horizontal surface (Figure). The

Question:

A large crate weighing 4500 N rests on four 12-cm-high blocks on a horizontal surface (Figure). The crate is 2 m long, 1.2 m high and 1.2 m deep. You are asked to lift one end of the crate using a long steel bar. The coefficient of static friction between the blocks and the supporting surface is 0.4. Estimate the length of the steel bar you will need to lift the end of the crate.