PHIL 4120 Lecture Notes - Formal Science, Empiricism, Logical Truth

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olivemacaw308

15 Nov 2011

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Hume knowledge was twofold: introspection and observation. Logical positivist we can only know by observation. Show the child a cow by exposing it to a cow. Logical positivist total set of the descriptions of the observable world that can be confirmed in laboratories, etc. Know the consequences of it being true that electrons exist, you know electrons exist. If you know how the world would look for the sentence to be true, then you understand the meaning. Statements true by definition duncan is a bachelor it follows that duncan is unmarried and a male. Teaching someone a term in terms of other terms you can point at. Possible experience that the statement can verify if the statement was true: truth/falsity can be told in a brief moment of experience (ex. Inspecting your own observations: terms of lists of observation sentences (ex. Theoretical sentences empirical meaning: logically determinant (ex.

Related Questions

It is an experimental observation that during electron irradiation of a material below a given electron energy no displacements are possible. Occasionally it is possible to observe damage even below Ed as a result of secondary displacements through light element impurities. If bcc Fe has a displacement energy of 40 eV and contains C. What purity Fe would be necessary to ensure that secondary displacements are limited to 1/100 of the primary displacements at an electron energy of 900 keV? The displacement cross-section for 900 keV electrons is 30 b in Fe and 20 b in C. IF needed, consider Ed for C to be 25 eV.

A uniform electric field having a magnitude of 2x103 N/Cexists between the lower, positively charged, and upper, negativelycharged, plates shown where L=10.0cm and d=2.00cm. If an electronis âlaunchedâ from point âAâ with a velocity of magnitude 6x106 m/sand direction of 45Âº, as indicated:

a) Which, if either, of the plates will the electronstrike?

b) If the electron strikes a plate, at what horizontaldistance to the right of âAâ will the

impact occur?

Notes: Assume the effect of gravity on the electron?sacceleration is negligible and that the electron experiences only2-D motion.

The circuit shown above consists of a single battery, whose emf is 1.8 V, and three wires made of the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.1e-6 m², and is 25 cm long. The thin wire has cross-sectional area 4.8e-8 m², and is 5.1 cm long. In this metal, the electron mobility is 3e-4 (m/s)/(V/m),and there are 4e+28 mobile electrons/m³.

a) Which of the following statements about the circuit in the steady-state are true?

The electron current at location D is the same as the electron current at location A.

At location B the electric field points toward the top of the page.

The magnitude of the electric field at locations D and F is the same.

The magnitude of the electric field at locations F and C is the same.

b) The symbol E_F represents the magnitude of the electric field at location F, and the symbol E_D represents the magnitude of the electric field at location D. Which of the following equations is a correct energy conservation (loop) equation for this circuit, following a path that starts at the positive end of the battery and goes clockwise?

0 = +1.8V - E_F*0.25m -E_D*0.051m -E_F*0.25m

0 = -1.8V+ E_F*0.25m +E_D*0.051m +E_F*0.25m

0 = -1.8V - E_F*0.25m -E_D*0.051m -E_F*0.25m

0 = 1.8V +E_F*0.25m +E_D*0.051m +E_F*0.25m

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PHIL 4120 Lecture Notes - Formal Science, Empiricism, Logical Truth

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