A certain circuit includes a voltage source VS, a fixed resistor R1, and a potentiometer Rv all in parallel. Help me study for my Physics class. I’m stuck and don’t understand.
(a) Draw the circuit
(b) Calculate the output voltage of the potentiometer if VS = 10 V, R1 = 1 kohm, Rv = 1 kohm, and the pot is set at its midpoint.

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o

You can decrease the resistance of a length of wire by