Carbonated beverages "go flat" / lose their carbonation over time as CO2 that is dissolved in the beverage diffuses out of the container, thereby escaping the liquid beverage. Which diffusivity (also called the diffusion coefficient, D) would you expect to be higher at, say, 25°C?

a. CO2 through aluminum (a very common metal for beverage cans).
b. CO2 through polyethylene (PE, a very common plastic, eg gallons of milk are sold in PE containers).
c. CO2 through steel (a less common beverage container these days).

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Asteel wire of 2 mm diameter is fixed between two points located 2 m apart. the tensile force in the wire is 250n, if its density of steel is given by 7830 kg/m3 the fundamental frequency of vibration hz? ?

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?