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A machine of efficiency 80% is used to raise a body of mass 75kg through a vertical height of 3m in 30s. Calculate the power imput. ( g = 10ms2)
Power is define as the
Which of the following has the same unit as the moment of a force?
A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is10m s-2, the power expended is
In which of the following simple machines is the effort applied between the load and the fulcrum?