A small hole in the wing of a space shuttle requires a 16.0 cm2 patch.   (a) What is the patch's area in square kilometers (km2)? Enter your answer in scientific notation.     × 10   km2   (b) If the patching material costs NASA $3.73/in2 , what is the cost of the patch to the nearest cent?

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Metrology of surface finish

In general terms, the application of scientific principles in the study of measurements is known as metrology. When speaking about measurement, it could be of time, length, microstructures, grain structures, internal crystal discontinuities, surface roughness, measurements of angles, height, width, and so on. While coming to the domain of mechanical engineering, metrology is considered the science of measurements of surface finish, length, surface texture, and angles.