You place a fireplace poker into the coals of a hot fire (500 degrees c). the poker is made of steel, 50cm long with a diameter of 1.5cm. a) if the other end of the rod is maintained at 31 degrees c, what heat current exists in the rod? b) how long does it take to transfer 10 kj of thermal energy? c) how would the answer to b change if the rod was copper?

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.