<span>1.
</span><span>Efficiency is the
measure of how efficient a process is. It is used to assess the ability of a
process in avoiding waste energy, materials, money and time in doing a
desirable output. It is calculated as;
Efficiency = useful energy ouput / total energy input</span>
The useful work produced by a pulley system is 80 Joules.
Explanation:
Efficiency is a measure of how much work is preserved in a process. The formula for efficiency is the energy output, divided by the energy input, expressed as a percentage. A perfect process would have an efficiency of 100%.
η = efficiency (Greek letter "eta")
Wo = the work or energy produced by a process. Units are Joules (J).
Wi = the work or energy put in to a process. Units are Joules (J).