where a single prime denotes the real part and a double prime the imaginary part, Z() is the complex impedance with the dielectric present, Ccmplx() is the so-called complex capacitance with the dielectric present, and C0 is the capacitance without the dielectric. (Measurement "without the dielectric" in principle means measurement in free space, an unattainable goal inasmuch as even the quantum vacuum is predicted to exhibit nonideal behavior, such as dichroism. For practical purposes, when measurement errors are taken into account, often a measurement in terrestrial vacuum, or simply a calculation of C0, is sufficiently accurate.)
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Why is the value of C0 unattainable in reality?
Ah, so.. even the quantum vacuum is predicted to exhibit nonideal behavior

Industries slowly brought the city and its inhabitants back to a renewed vitality and jobs attracted new residents. As the city's commerce improved, residents worked to restore or create community institutions. In 1865, the Avery Normal Institute was established by the American Missionary Association as the first free secondary school for Charleston's African American population. General William T. Sherman lent his support to the conversion of the United States Arsenal into the Porter Military Academy, an educational facility for former soldiers and boys left orphaned or destitute by the war. Porter Military Academy later joined with Gaud School and is now a university-preparatory school, Porter-Gaud School.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What association never founded the Avery Normal Institute?
Ah, so.. unanswerable

Plymouth Council is currently undertaking a project of urban redevelopment called the "Vision for Plymouth" launched by the architect David Mackay and backed by both Plymouth City Council and the Plymouth Chamber of Commerce (PCC). Its projects range from shopping centres, a cruise terminal, a boulevard and to increase the population to 300,000 and build 33,000 dwellings.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many residences does the "Vision for Plymouth" seek to build?
Ah, so..
33,000