Which refers to the ratio of output force to input force of a machine?

mechanical advantage

average strength

total power

energy requirement

Mechanical advantage refers to the ratio of output force to input force of a machine.

Explanation:

The formula for mechanical advantage is MA= D/d where D denotes output force and on the other hand, d denotes input force. Mechanical advantage can be increased when the fulcrum moves very close towards the load and another way of increasing mechanical advantage is that when the effort moves away from the fulcrum. Through mechanical advantage we come to know how much force is exerted by a machine when force is applied on the machine.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later