An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 38 . it has been determined that fracture results at a stress of 223 mpa when the maximum (or critical) internal crack length is 2.85 mm. a) determine the value of for this same component and alloy at a stress level of 334 mpa when the maximum internal crack length is 1.43 mm. g

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)?