PP111 Lecture Notes - Lecture 1: Personal Identity, Sophia (Wisdom)

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19 Sep 2015

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Pp111 lecture #1 september 16th 2015: theories of knowledge: epistemology . Perception, testimony: theories of reality: metaphysics . What is philosophy: what philosophy is not: In the practice of philosophy, no idea is immune to critical scrutiny. Every question is meant to be challenged. Good questions are as valuable as good answers. It is not the psychology/sociology of belief. Philosophers attempt to provide justifications for beliefs, not explanations of them. We can explain why someone believes a certain thing without necessarily holding that belief ourself: eg. i believe that spiderman is in the wlu library. Explination: i have taken a hallucinogenic drug: this is not relevant to whether my belief is true, when others know the explanation of me belief, it does not give them any reason to share my belief. What is philosophy: philosophy is love ( philos ) of wisdom ( sophia )

Related Questions

1. Use the classical wave equation (Helmholtz equation) to showthat the superposition of two one-dimensional harmonic waves y =y(x,t), one traveling to right and the other one traveling to theleft is a wavefunctions that represents a classical wave that couldpossibly exist in nature. What does the superposition of these twowaves actually represent?

I am just not sure how to set this problem up. I know I canuse:
y₁=Asin(kx-Ït)

y₂=Bsin(kx+Ït)

Y=y₁+y₂

I just do not understand what is being asked of me?? Pleasehelp.

Here is a popular lecture demonstration that you can perform athome. Place a golf ball on top of a basketball, and drop the pairfrom rest so they fall to the ground. (For reasons that shouldbecome clear once you solve this problem, do not attempt to do thisexperiment inside, but outdoors instead!) With a little practice,you can achieve the situation pictured here: The golf ball stays ontop of the basketball until the basketball hits the floor. The massof the golf ball is 0.0459 kg, and the mass of the basketball is0.591 kg.

a) If the balls are released from a height where the bottom of thebasketball is at 0.741 m above the ground, what is the absolutevalue of the basketballâs momentum just before it hits theground?

b) What is the absolute value of the momentum of the golf ball atthis instant?

c) Treat the collision of the basketball with the floor and thecollision of the golf ball with the basketball as totally elasticcollisions in one dimension. What is the absolute magnitude of themomentum of the golf ball after these collisions?

d) Now comes the interesting question: How high, measured from theground, will the golf ball bounce up after its collision with thebasketball? (Hint: do not forget to add the diameter of thebasketball, 24.15 cm).

http://www.flickr.com/photos/60996491@N03/5592819537/

i found a and b section a)2.253 kg*m/s and b)0.175 kg*m/s but idont know c and d. please help me....

Theory: Topics that you should be familiar with are: significantfigures, least count and estimated fraction, systematic and randomerrors, accuracy versus precision, percent difference and percenterror. These topics should have been covered in class already (orperhaps in an introduction to the lab manual or in a handout). Itis assumed that the instructor has discussed how to use the massbalance, etc.
Introduction: The goal of section I of this experiment is tomeasure (to the correct least count and estimated fraction) andcalculate (to the correct number of significant figures) thedensity of a metal ball and compare it to a table of accepteddensities (?=7.8x103 kg/m3).
To accomplish this goal keep in mind that: ? = m/V and Vsphere =(4/3) p r3
In the space below create a data table, show your calculations indetail, and compare your measured answer to accepted values givenabove. (Would you calculate a percent error or a percentdifference?)
1
II. Is g (the acceleration due to gravity) a constant? If so, whatis it?
1) SetuptheFree-FallApparatusasdemonstratedbytheinstructor.
2)MeasurethetimeittakesforthemetalballtofallthroughthesuggesteddisplacementsshowninDataTable 1. Be sure to do 4 trials for each fall and take the averageof your time and displacement. For each trial measure thedisplacement and record your results as precisely as possible. Becareful how you measure the displacement!
Data Table 1
Displacement (meters) Time
Trial 1
___.40___ m .281 s
______.40_ m .284 s
___.40____ m .283 s
____.40___ m .285 s
Average Displacement =.40 m Average time .0285 s
Trial 2
____.60___ m .357 s
____.60___ m .358 s
_____.60__ m .347 s
____.60___ m .347 s
Time (seconds)
Average Displacement = .60 Average Time = .352
Trial3
_.80____ m .402 s
_.80____ m .401 s
_.80______ m .402 S
_.80___ m .401 s
Average Displacement = .80 m Average Time =.401 s

Trial4
__ 1.00____ m .454 s
___1.00____ m .453 s
___1.00____ m .463 s
___1.00____ m .453 s
Average Displacement = 1.00 m Average Time =.455 s
3)PlotDisplacement(usetheaveragedisplacement)asafunctionofTime(usetheaveragetime)usingacomputer software that you know the best. (Does Displacement orTime go on the âverticalâ (or y) axis? Make sure that you label theaxes of your graph properly and give the graph a descriptivetitle.), Please include (0,0) point.
4)UsetheCurveFitFunctiontotrytofindthecurvethatistheclosestfitforthegraph.Whichofthefollowing curve types gives the best fit? Try each to findout.
a) linear fit? b) quadratic (power 2)? c) exponential? d) Power?
The curve with the correlation coefficient (R) closest to 1 has theclosest fit. (e.g. 0.997 is better than 0.956)
5)Printthecurvewiththeclosestfit(oneforeachmemberofthelabgroup).Besureyourgraphincludesthe equation for your fit.
6)Canyoudeterminetheexperimentalaccelerationofgravityfromthisgraph?Explainhowandshowyourwork.
7)Ifalinearfunctionisnotthebestfitofyourplotfromstep3),howwouldyouplotdisplacementandtimeso that the resulting plot is linear? Explain. (Ask your instructorfor a hint if you are not sure of what to do, but be sure to thinkabout it for a while before you ask.)
3
8)Printacopyofthegraphforeachlabpartnershowingalinearfittoyourdataandproperlylabeledaxes.
9)Canyoudeterminetheexperimentalaccelerationduetogravityfromthisgraph?Explainandshowyourwork.
10) How do your experimental values of âgâ compare with theaccepted value (g = 9.80 m/s2) for the acceleration of gravity?Give a mathematical comparison using what you learned aboutmeasurements previously. (Show work)
4
Question and further procedures
1. What is the greatest source of error in performing theexperiment? Is this error random or systematic? Explain.
2. At this point you should have calculated g in two different ways(A quadratic graph, and a linear graph). Which technique do youthink is best? Do all two techniques give the same answer? If not,which technique do you think has the most error?
3. How might you modify your procedures to determine whether or notg depends on the mass of the falling object? Do the experiment andcalculate g using your favorite technique.

PP111 Lecture Notes - Lecture 1: Personal Identity, Sophia (Wisdom)

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