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प्रश्न
Can a machine have an efficiency of 100%? Give a reason to support your answer.
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उत्तर
Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
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संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
Give a reason for the following.
Machines are able to make our work convenient.
The correct relationship between the mechanical advantage (M.A.), the velocity ratio (V.R.) and the efficiency (n) is ______.
What is the efficiency of an ideal machine?
How does a machine work?
A simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
Classify the following as a lever, a pulley and an inclined plane:
A slide
Which machine will you use to do the following work? Write their type.
To cut vegetables.
Why is this so machines have to be maintained?
______ help us to make work easier.
