Question

1 is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work). a work b power c efficiency d mechanical advantage

Explanation:

Efficiency is defined as the percentage of input work that is converted into output work in a machine. Work is the product of force and displacement. Power is the rate of doing work. Mechanical - advantage is the ratio of the output force to the input force.

Answer:

C. Efficiency