Philosophy 1305F/G Lecture Notes - Lecture 8: Cud

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25 Apr 2012

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Rumination - contemplation: a calm, lengthy, intent consideration. Like the way a cow chews cud, and continues to regurgitate it and re-chew it until it becomes completely digested. Similarly, we continue to digest and re-digest opinions and information until we completely understand it. Actions are called human or moral insofar as they proceed from reason. st. thomas. A lot of us perform actions that are not moral or immoral actions (e. g. breathing, blinking, heart beating, etc. ). In no way are they connected to deliberation. What is proper to us as human is our rationality. This can be translated to mean that jack the ripper is as moral in his actions (of killing) is as moral as mother theresa"s actions, as it comes from his/her person and their rationales. Reason is in reference to a universal standard of judgement related to the here and now. This act is called practical reason - we pursue the truth for the sake of action.

Related Questions

The given explanation for solving the problem did not go into agreat deal of detail on deriving the 2nd equation: v^2=2ukgX. I'massuming that this equation is generated from an equation forconstant acceleration V^2= Vo^2 + 2a(X-Xo) and understanding thatthe sum of the horizontal (or vertical forces) is SumF=ma and theonly force acting on the mass is friction force, therefore,uk(m1+m2)g=(m1+m2)a and ukg=a.

My questions is this:
In the explanation, there seems to be an assumption that Vo is 0.Why can this assumption be made?

I'm probing because I've been following the explanation to answerthe question, and I continue to get it wrong.

Thank you,
SJ

a) For an image that is in front of a mirror, is the imagedistancepositive or negative?
b) Given the image distance, what additional information isneededto determine the focal length? Explain.
c) For an inverted image is the image height positiveornegative?
d) Given the object and image heights and a statement as towhetherthe image is upright or inverted, what additionalinformation isneeded to determine the object distance?
e) A small statue has a height of 3.5 cm and is placed in front ofaconcave mirror. The image of the statue is inverted, 1.5 cmtall,and is located 13 cm in front of the mirror. Find the focallengthof the mirror.

a) The drawing shows a ray of light traveling throughthreematerials whose surfaces are parallel to each other. Therefractedrays (but not the reflected rays) are shown as the lightpassesthrough each material. Taking into account the relative sizesofthe angles of incidence and refraction, rank thematerialsaccording to their indices of refraction, greatest first.Providereasons for your rankings.
b) A ray of light strikes the a-b interface ata50.0^o angle of incidence. The index of refractionofmaterial a is n_a = 1.20. The anglesofrefraction in materials b and care,respectively, 45.0^o and 56.7^o. Findtheindices of refraction in these two media

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

Philosophy 1305F/G Lecture Notes - Lecture 8: Cud

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