Notes, abstracts, papers, exams and problems of Physics

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Physical Exercises

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Six 19.4 moles of ideal gas are in a cylinder fitted at one end with a movable piston. The initial gas temperature is 27.0 ° C and the pressure is constant. As part of a proposed machine design, calculate the final temperature of the gas once it has made 1.75x10 ³ J of work.
n = 6 moles isobaric process
T? = 27 ° C
P = CTE.
W = 1.75 * 10 ³ J
PV = nRT
V? = Vf =

W = P (-)

Pf = P: = P

W = (nRTf - nRT?)

W + nRT? = NRTf

Tf =

Tf =
Tf = 335.24K

19.8
Work done in a cyclic process. a) In Figure 19.8a, consider the closed loop 1 3 2 4 1. This is a cyclical process in which the initial and final states are the same. Calculate the total work done by the system in this process and show that equals the area enclosed by the cycle. b) What... Continue reading "Physical Exercises" »

Asasd

Classified in Physics

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(M02)Lunar embasy 1a)F. But...a rocket b)So far...apiece 3a)views b)roaring c)prohibited d)grateful 4a)have bought/but b)signed/with Smile you are camera(M03) 1a)T.And as...growing b)F.If the program...department 3a)implement b)radio c)high d)argue 4a)were/that b)had/what A relative difference (M04) 1a) F."This similarity...chimpanzees"b)F."development and...that now" 3a)link b)skull c)leap forward d)seemingly 4a)If you don´t ask him a question,he won´t speak to you. I´m working from home(M05)1a)F"For the Spanish...reason b)T"Overall,fewer...to do" 3a)choosing b)survey c)opportunity d)switch 4a)have worked/per b)to get/to. Should the State tell...drink?(M06) 1a)F"We eat on...else"b)F"A sociologist...dining table" 3a)enquiry b)almost c)entire... Continue reading "Asasd" »

Sdeasd

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Mamíferos: Las hembras tienen mamas que producen leche para alimentar a las crías, el cuerpo está cubierto por pelos. La función principal es proteger del frio al animal.
Pelaje: raíz dentro del funículo piloso .Los pelos nuevos sacan los pelos viejos. La glándula sebácea lo hace más flexible el pelo. Lana (largo y fino), cerda (áspero y grueso), vello (suave y corto) y púa (largo y puntiagudo)
La temperatura: Es constante. Si sube o baja la temperatura siempre se mantiene constante.
Hibernación: desciende -10 Cº / Duerme no come y se esconde.
Invernación: baja la temperatura pero un duerme profundamente, come y hace algunas actividades.
La fecundación interna se produce en el ovulo con el esperma.
Sistema digestivo: Boca -faringe-

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Fyq

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valencias:(H,F=1);(CL,BR,I=1357);(O=-2);(S,Se,Te=246);(N=12345);(P=135);(A,Sb,Bi=35);(B=3);(C=24);(Si=4);(Li,Na,K,Rb,Cs,Fr,Ag=1);(Be,Mg,Ca,Sr,Ba,Ra,Zn,Cd=2);(Cu,Hg=12);(Al=3);(Au=13);(Fe,Co,Ni=23);(Sn,Pb,Pt,Ir=24)(Cr=23456);(Mn=23456)

Hidruros volatiles:NH3=amoniaco;N2H4=hidrazina;PH3=fosfina;P2H4=difosfina;AsH3=arsina;As2H4=diarsina;SbH3=estibina;CH4=silano;Si2H6=disilano;BH3=borano;B2H6=diborano.

Physical and chemical energy

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TEMP CELSIUS TO FAHRENHEIT; (1.8*C)+32=F

FAHREN TO CELSIUS:(F-32)/1.8=C
TO GET KELVIN: add 273.15 to celsius.
KELVIN TO CELSIUS: add 273
CELSIUS TO KEVIN: menos 273.
   FORMULAS
   Q= U-W
Q=MCAT          
DEFINITIONS:
 -THERMODYNAMICS:dexcribe the transfer of energy(deals with the relationship between heats and other forms of energy).-ENTROPY:the amount of disorder in a system.-ENTHALPY;change in heat or measure of heat content. -GLISS FREE ENERGY:amount of energy in a system that is available to do work. -ABSOLUTE ZERO:lowest temperature. -RADIATION:energy transmitted in waves. -CONDUCTION: transfer of energy. CONVECTION heat is transfered by mass or liquid. 1ST LAW: heat is a form of energy, conservation of energy, 2ND LAW:states that
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gtrhy

Classified in Physics

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terrible time-keeper, shopaholic,untidy,obsessively well organized,countless, tiny, inhospitable, furious, even, major, single-minded, addictive, bald-headed, bad-tempered, brown-eyed, curly-haired,easy-going,long-legged, rosy-cheeked, suntanned, warm-hearted, broken-hearted, absent-minded, broad-minded, self-centred, self-disciplined, big-headed, hard-headed, amazed/amazing, bored/boring, interested/interesting, pleased-pleasing, worried-worrying, satisfied/satisfying, casual, colourful, crowded, excited, formal, grand, imposing, relaxed, sophisticated, spacious.

Ankle(tobillo en el pie), calf(la parte de atras de la pierna baja), elbow(codo), heel(donde los tacones), hip(cadera), palm(palma de la mano), shin(parte delanteda pierna abajo),
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Air law

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Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.

Strength is about the ability to withstand forces without permanent change e.G breakage. So hardness is one type of strength, just like tensile and compressive strength.

The toughness of a material is the maximum amount of energy it can absorb before fracturing, which is different from the amount of force that can be applied.

Stiffnessthe extent to which an object resists deformation in response to an applied force. The opposite of stiffness is elasticity - how far an object will stretch when pulled with a given amount of force.

Hardness measures the pressure needed to cause permanent change. Strength measures the load that... Continue reading "Air law" »

Mass and balance

Classified in Physics

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Introduce George Orwell's life and works (refer to main issues, do not focus only in 1984)

His real name was Eric Arthur Blair. George Orwell was an essayist, Novelist, literary critic and fighter for political change. He was born in 1903, India (which was a British territory) He experienced many hardships in Its puritanical cutthroat environment. In the autobiographical essay “Such, Such were the Joys” Orwell describes the social challenges he endured as a Scholarship student among England´s wealthy elite (these challenges would Inform his satires of social stratification in his literary works, such as “Animal Farm”) In the said essay, he describes his child self with much sympathy and Feeling for the child´s perspective, he wasn´t

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The beginnings of english: old and middle english 600-1485 setting the scene the first literature

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Tema 2

TEMA 2.High middle ages(1001-1300) and late m.A(1300-1485).Ongoing Expansion of islamic faith.Anglo-Sxon england invaded by William ,duke of Normandy.They Took literal possessions.Anglosazon=>Norman->Feudalism.Feudalism:complez social organisation based on functions and jiearchies. Functions: Oratores,bellatores,laboratores.Hierarchical: form superior to inferior According to essential degree.Defining features of the english medieval Period:-Resistance to monarcha´s feudal power.-Instability of political Power.-Pope´s authority also contested(Thomas becket´s murder in Canterbury)-Origin of some genuine institutions(oxford university, cambridge...)-Population Increase+developement of cities as centres of production and Commerce-

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Mass and balance

Classified in Physics

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·Describe each step of The Scientific Method.

Purpose: Ask a question,Hypothesis:This is a sort of educated guess about what you Expect. ,Experiment: Design and perform an experiment to test your Hypothesis., Collect data: Record observations and analyze what the data means. Often, you'll prepare a table or graph of the data., Conclusion: Conclude Whether to accept or reject your hypothesis. Communicate your results.

Volume: cm3, length: mt,cm , Mass: Kg, grams,milligrams, Temperature: C° or F°

o5 Examples of each (be able to identify what unit is used when an example is Given)

Volume: When measuring the volume of a Rectangular prism - Multiply the measurement of The length times the width, then times the height

Length: We can measure how long

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