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प्रश्न
Define the term efficiency of a machine.
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उत्तर
It is the proportion of the machine's useful work to the effort's input into the machine.
Efficiency η = `"Work output"/"Work input" xx 100%`
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संबंधित प्रश्न
Explain the term mechanical advantage.
Define the term velocity ratio.
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- State the relationship between mechanical advantage, velocity ratio and efficiency.
- Name the term that will not change for a machine of a given design.
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Draw a diagram to illustrate the position of fulcrum load and effort, in the following:
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Draw a diagram to illustrate the position of fulcrum load and effort, in the following:
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Figure below shows a wheel barrow of mass 15 kgf carrying a load of 30 kgf with its centre of gravity at A. The points B and C are the centre of wheel and tip of the handle such that the horizontal distance AB = 20 cm and AC = 40 cm.
Find:
- the load arm,
- the effort arm,
- the mechanical advantage and
- the minimum effort required to keep the leg just off the ground.
A fire tongs has arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance 15 cm from the fulcrum. Find:
- the mechanical advantage of fire tongs and
- the effort needed.
Mechanical advantage = ______ × velocity ratio.
