Nak (55%/44%), which is an alloy of sodium and potassium, is used to cool fast neutron nuclear reactors. the nak flows at a rate of latex: \dot{m} = 0.8 kg/sm ˙ = 0.8 k g / s through a d=40-mm-diameter tube that has a surface tube at t­m, i = 335 k and exits at an outlet temperature of tm, o =397 k. deter- mine the tube length l and the local convective heat flux at the tube exit.

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.