Una pregunta del significado de luminosity

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.