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Prove that if k varies linearly with T in a slab, and if heat transfer is one-dimensional and steady, then q may be evaluated precisely using k evaluated at the mean temperature in the slab.
a boy throws a ball straight up from the top of a 12m tower. if the ball falls past him 0.75 s later determine the
if a kitchen sink water tap leads one drop per second how many gallons of water are wasted annually? what is the mass
air at 40oc 1 bar and a volumetric flow rate of 60 m3min enters an insulated control volume operating at steady state
the composite shaft consists of three sections 1 a solid brass core 2 a middle steel tube and 3 an outer aluminum tube.
the crate moves up the incline a distance d 5 ft due to the action of the constant force p 100 lb. the weight of the
consider a piston-cylinder assembly containing 0.12 kg of nitrogen at 300 k and 1 atm state 1. the nitrogen is heated
the ball at is kicked such that 60 . if it strikes the ground at having coordinates 25 -25 determine the speed at
the collecting panels of a solar boiler receive energy as heat at the rate of approximately 300 btuhr-ft2 of collecting
One kg of air in a piston-cylinder assembly undergoes two processes in series from an initial state where p1 = 0.5 MPa, T1 = 227oC. Process 1-2: Constant-temperature expansion until the volume is twice the initial volume. Process 2-3: Constant-volume..
the members of the truss shown can withstand a maximum compressive force of 800 lb and a maximum tensile force of 2000
lie detectors are sometimes used in criminal investigations but they do not function perfectly. if a suspect is guilty
consider the steel balls from 5.6 except now the air tempincreases with time as tinft325kat where a 0.1875ks.asketch
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