How is the mechanical efficiency of a machine usually expressed?
1 answer:
Answer:
As a percentage
Explanation:
The mechanical efficiency of a machine is the percentage of energy in input to the machine that is converted into useful work.
Mathematically, the efficiency of a machine is given by:
where:
W is the useful work in output from the machine
E is the energy in input to the machine
For example, a machine with 80% efficiency means that it converts 80% of the input energy into work.
A machine can never be 100% efficient, since part of the input energy is wasted due to the presence of frictional forces.
So, the efficiency of a machine is expressed as a percentage.
You might be interested in
To solve this problem we will apply the concepts related to equilibrium, for this specific case, through the sum of torques.
If the distance in which the 600lb are applied is 6in, we will have to add the unknown Force sum, at a distance of 27in - 6in will be equivalent to that required to move the object. So,
So, Force that must be applied at the long end in order to lift a 600lb object to the short end is 171.42lb