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प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
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उत्तर
The useful work done by an actual machine is always less than the work done on the machine.
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संबंधित प्रश्न
Select the correct alternative:
For an ideal machine, the efficiency is
What is the principle on which a machine works?
A machine is 75% efficient’. What do you understand by this statement?
Write the relation between mechanical advantage, velocity ratio and efficiency.
Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable.
(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.
(ii) What is the velocity ratio of the system?
(iii) What is the mechanical advantage of the system?
(iv) What assumption do you make in arriving at your answer in part (iii)?
Define Simple machine
What is the efficiency of an ideal machine?
Why is this so machines have to be maintained?
Name some simple machines.
Simple machines usually exchange a larger force to move a heavy object.
