What is the efficiency of a machine, given mechanical advantage is 2 and velocity ratio is 4?

Answer true or false: If the efficiency of a machine is 100%, the mechanical advantage equals the velocity ratio.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long. (a) to which class does it belong ? (b) Draw a diagram of the lever showing the position of the fulcrum F and directions of both the load L and effort E. (c) what is the mechanical advantage and velocity ratio if the efficiency is 100%? (d) What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?

What is the ratio between mechanical advantage and velocity ratio of a practical machine.

In the following figure : What is the efficiency of this pulley system if the mechanical advantage is 3?

What is the ratio between mechanical advantage and velocity ratio of an ideal machine.

The efficiency of a simple machine having mechanical advantage 5 is 80% . If the displacement of the effort in lifting a load by using the machine is 20 cm, find the displacement of the load.

A pulley has a velocity ratio 2. but mechanical advantage 1-6. Name the pulley and state factors which make the mechanical advantage less than the velocity ratio.