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)

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

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Acertain flow of air (at stp) has a velocity distribution given by v i (in ft/s). if this flow is going through a 4 ft square area in the yz-plane (centered at the origin), what is the mass flow rate (in lbm/s)?