What happens when a cold air mass meets a warm air mass that is not moving?

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?

A36,287 kg truck has a momentum of 907,175 kg • . what is the truck’s velocity

What does the negative sign in f = –kx mean?