How can different type of matter be distinguished from each other

What are the applications of electromagnetic waves

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?

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?