3. an underground copper pipe is used to transport oil under a factory. it is very important that this pipe does not oxidize, so engineers use impressed current cathodic protection. a. would zinc be an appropriate metal to use for cathodic protection? why or why not? (4 points) b. engineers attach a sacrificial anode to the copper pipe. to use impressed current cathodic protection, they must attach a battery between the cathode and anode. which material should the positive side of the battery be attached to? explain how you know. (4 points)

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.

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.