Apulley system has an efficiency of 74.2%. if you perform 200 j of work, how much useful work does the pulley perform?
a.200 j
b.148 j
c.52 j
d.113 j

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

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

like poles repel so keep pushing north to north and repels funny to see this