A 57 kg skip attached to a steel rope on a crane is used to hoist bricks from the ground to the top of a construction site.  The steel rope is wound onto a lifting drum with a diameter of 700 mm and rotational frequency of 68 revolutions per minute.  The lifting drum is situated on the top floor. Calculate the efficiency of the lifting generator, if the electric motor power of 9000 W is needed to drive the loaded skip.

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.