​(a) The diagram in the figure below represents a wheel and axle used as a machine, whose efficiency is 80% to raise 400N of building materials. The wheel and axles have diameters of 75cm and 15cm respectively.
​(i) Mark on the diagram the correct position and direction of the load to be lifted (1mk)​(ii) Name the principle on which this machine works (1mk)
​The principle of moments
​(iii) Calculate the effort needed to raise the load (3mks)
​(iv) The machine is operated manually and raises the load to a height of 5m in 20 seconds. Calculate the power developed by the operator (2mks)(b)
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
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