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प्रश्न
A machine is 75% efficient’. What do you understand by this statement?
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उत्तर
If a machine is 75% efficient, it means that 75% of the work input to the machine is obtained as the useful work output. The remaining 25% of the work input has been lost in overcoming the friction.
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संबंधित प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
What do you understand by a simple machine?
What is the purpose of a jack in lifting a car by it?
Can a simple machine act as a force multiplier and a speed multiplier at the same time?
Define mechanical advantage (M.A.) of the machine.
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
Classify the following as a lever, a pulley and an inclined plane:
An opener
What is a lever?
