PHIL 200 Chapter : Ontology

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scarletalpaca925

22 Apr 2012

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Senses give us a perspective that"s constantly changing. What we sense is not conductive to knowledge. Everything we perceive through our physical bodies are particulars. Process behind knowledge is recollection if so, you have to know the forms already. Logically, you"d know them before you were born. It is lost when you"re embodied and you have to recollect during your life time. Recollection shows the soul existed before being born: soul continues to exist after death. To view invisible objects, you need to have a visible instrument. Times new roman, 12, double spaced quotations necessary with references (names of dialogue, and section from which it was taken [66b]) (according to plato, knowledge is acquired by recollection, whereas true opinions are not recollected. Discuss the difference between knowledge and true opinion, giving examples of both.

Related Questions

1a) Faraday discovered that a current is induced in a coil

A) only when the N pole of a magnet is inside the coil
B) only when the S pole of a magnet is inside the coil
C) only when there is a magnetic field inside the coil
D) only when the magnetic field inside the coil is changing

1b). A conductor moves through a uniform magnetic field at speed v and has a motional emf V created across it. If the conductor were to move twice as fast through the magnetic field, the motional emf would be:

A) V
B) 2V
C) 4V
D) V/2
E) V/4

1c) In the conducting rail discussed in section 25.2 (where the rail is moving at constant speed), what can you say about the power input due to the person pulling on the rail and the power dissipated in the resistance?

A) Power input from pull = power dissipated in R
B) Power input from pull > power dissipated in R
C) Power input from pull < power dissipated in R

1d) The electric generator as shown in the reading generates electricity by:

A) rotating a loop inside a magnetic field
B) moving a magnet in and out of a loop
C) sliding a loop over a magnet
D) running current through a loop in a magnetic field

1e) The magnetic flux through a loop:

A) is proportional to the number of magnetic field lines going through it
B) depends just on the B field going through the loop
C) is maximized when the B field lines in the plane of the loop
D) is zero when the B field is perpendicular to the plane of the loop
E) doesn't depend on the direction of the B field

1f) According to Lenz's Law, the induced B field (due to the induced current) will:

A) be in the opposite direction of the existing B field
B) be in the same direction as the existing B field
C) be in the same direction as the change in the existing B field
D) be in the opposite direction of the change in the existing B field

1g) A stationary coil experiences a doubling of its magnetic field (no change in direction of the field) in a time T and has a given induced EMF. If the same change were to have happened in half the time (T/2), the induced EMF would have been:

A) half as large
B) the same
C) twice as large
D) one-fourth as large
E) four times as large

1h) Eddy currents:

A) make it hard to pull a nonmagnetic material through a magnetic field
B) make it hard to pull a magnetic material through a magnetic field
C) speed up a magnetic material moving through a magnetic field
D) speed up a nonmagnetic material moving through a magnetic field

cerisejackal809

In an electrostatic aircleaner("precipitator"), the strong nonuniform electricfield inthe central region of a cylindrical capacitor (with outerand innercylindrical radii Ra and Rb) is used to createionized airmolecules for use in charging dust and soot particles.Understandard atmospheric conditions, if air is subjected to anelectricfield magnitude that exceeds its dielectricstrength Es=2.7x10^-6,air molecules will dissociate intopositively charged ions and freeelectrons. In a precipitator, theregion within which air is ionized(the coronadischarge region) occupies a cylindrical volumeofradius R that is typically five times that of the innercylinder.Assume a particular precipitator is constructedwith Rb = 0.15 mmand Ra = 18.0 cm.

In order to create a corona discharge region withradius R=5.0Rb,what potential difference V shouldbe applied between theprecipitator's inner and outer conductingcylinders? [Besidesdissociating air, the charged inner cylinderrepels the resultingpositive ions from the corona dischargeregion, where they are putto use in charging dust particles, whichare then "collected" on thenegatively charged outer cylinder.]

You will be utiizing a basicoptic system.

The index of refraction of theplastic cylindrical lens depends on wavelength. Choose an anglewhich gives a good color separation and measure the index ofrefraction for blue and red light.

Question:How big is the difference in indices of refraction? How good is theapproximation that n is constant for thismaterial?

If this question doesnt make sense..then just answer ittheoretically speaking. That is how would we go about checkingwhether or not it conforms with the n as the constant for thematerial... Thanks!

Background info:

ThePhysics

The Law ofReflection

The law of reflection states that for a plane mirror, the angle ofincidence is equal to the angle of reflection, and that the tworays lie in a plane.

normal

. A light ray perpendicular to the surface has an angle ofincidence 0Â°.

The Law of Refraction âSnellâs Law

A ray of light passing from one substance (index ofrefraction

n_{1)into another (index of refraction n}

2) across a plane boundary will be refracted. The angle the raymakes in one medium will be related to the angle in the secondmedium by the equation below, and that all rays lie in aplane.

(2)

Total InternalReflection

A ray incident on a medium with lower index of refraction willbe

totally internally reflected if sin Î¸1> n2/n1.There will be no transmitted beam for this incident angle. Ameasurement of the critical angle for total internalreflection can be used to determine the index of refraction of the substance.If n

2 = 1 (air), then the critical angle is:

sin Î¸c = 1/

1. (3)

Polarization byReflection â Brewsterâs Angle

If the angle between the reflected and refracted rays is 90Â°,then

tan Î¸

B = n2/n

1. (4)

At this angle, only light with polarization out of the plane ofreflection and refraction will be reflected. The reflected lightwill be completely polarized.

Figure3.

Refractionof Light Rays

Figure2.

Incidentand Reflected Rays

(1)

Always measure the angles with respect to the surface

PHIL 200 Chapter : Ontology

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