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Define the following terms as used in machines; i) Mechanical advantage ii) Velocity ratio (4marks) b) state the law of conservation of energy (2marks) c) In a machine, the load moves 2m when the effort moves 8m. If an effort of 20N is used to raise a load of 60N, calculate the efficiency of the machine. (4marks) d) A man uses an inclined plane to lift a 60kg load through a vertical height of 5metres. The inclined plane makes an angle of 30 o with the horizontal. If the efficiency of the inclined plane is 80%.calculate the i) Effort needed to move the load up the inclined plane at a constant velocity. ii) Work done against friction in raising the load through the height of 5 metres. (take g=10N/kg)
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