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प्रश्न
Select the correct alternative:
For an ideal machine, the efficiency is
विकल्प
greater than unity
less than unity
equal to unity
depends on the value of load
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उत्तर
equal to unity
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संबंधित प्रश्न
A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.
State whether the mechanical advantage of an inclined plane is equal to 1, less than 2 or greater than 1?
Give an example of the following uses of a machine:
to obtain gain in speed
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Give an example of the following use of a machine to change the point of application of the force.
(i) Calculate the mechanical advantage of the lever shown in the figure.
(ii) How do you define the mechanical advantage of a machine?
Classify the following as a lever, a pulley and an inclined plane:
A wedge
Classify the following as a lever, a pulley and an inclined plane:
A slide
Classify the following as a lever, a pulley and an inclined plane:
Scissors
Simple machines usually exchange a larger force to move a heavy object.
