At a Building Site in Perth, a Tower Crane Is

Multiple Choice

At a building site in Perth, a tower crane is lifting a 300 kg pallet of bricks upwards at a steady speed. The cable from which the bricks are suspended has a circular cross-section of radius 1 cm. What is the tensile stress in this cable?

A) 9.4x106 N m-2.
B) 9.5x105 N m-2.
C) 95 N m-2.
D) 936 N m-2.
E) 9.4x104 N m-2.