At a Building Site in Perth, a Tower Crane Is

question 16

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.

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Block Design

A type of experimental design that groups subjects or experimental units into blocks to control variability among them.

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A variable that is manipulated or categorized to investigate its effect on a dependent variable.

Comparative Study

A research method that involves comparing two or more groups or variables to determine significant differences or similarities.