The temperature coefficient of resistivity of iron is 5.0 x 10–3/ºC; that of carbon is –0.50 x 10–3/ºC. When an iron wire and a carbon rod, each having the same 10 Ω resistance at 20ºC, are cooled from that temperature to –80ºC, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is Group of answer choices +1.9 –10 +2.1 –0.10 +10

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Which branches of natural science include the study of an organism that lived 10 million years ago

Acircuit contain a 5-ohm,a3-ohm,and an 8-ohm resistor in series. what is the total resistance of the circuit ?