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

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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-

... Continue reading "Sdeasd" »

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.

13653 a fire detection system

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The Science of Life in the Universe

The possibility of Extraterrestrial life was first considered: many thousands of years ago during Ancient times

The methods of modern science were Originated by the: Greeks

geocentric model: spherical Earth at the Center of the universe surrounded by a celestial sphere

In the heliocentric (Sun-centered) model: relative Motion between the Earth and another planet in its orbit

Stellar parallax is the apparent: shift in Position of nearby stars as the Earth moves around the Sun

Kepler's 1st Law of planetary motion: the Orbits of the planets are ellipses with the Sun at one focus

Kepler's 2nd Law Of planetary motion: an imaginary line joining the Sun and planet sweeps out Equal areas in equal times

Kepler's 3rd Law Of... Continue reading "13653 a fire detection system" »

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-

... Continue reading "The beginnings of english: old and middle english 600-1485 setting the scene the first literature" »

Latitude of the position

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HEISENBERG’S UNCERTAINTY PRINCIPLE:

  • This principle was in favor of the wave nature of matter
  • It stated that it is impossible to simultaneously evaluate the precise position and momentum of particle. There is always some probability in predicting the position and momentum of a particle. Mathematically, it can be written as:

                   (Δx)(Δp) ≥ h/(2π)

Considering the above equation, 2 cases are possible:

  • Case-1- If precise momentum(p) of an electron is known, then its wavelength by De Broglie’s hypothesis will be constant:

              λ = h/p

It means that the wavelength has a fixed value and the wave is extended infinitely throughout the wave. Hence, it is impossible to find the position of the wave.

Mathematically,... Continue reading "Latitude of the position" »

Types of motor

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TYPES OF COMPOUNDS: Endocentric. There is a hyponymy relationship between the overall meaning of the compound and the meaning of the head. In other words, “compound” is a type of “head”. Gear box. Exocentric (metonymy): there’s no hyponymy relationship between the overall meaning of the compound and the meaning of the head. In other words, “compound” is not a type of “head” but… Scapegoat. Appositional: there’s a bidirectional hyponymy relationship between A and B. In other words, A is B and B is A. The referent of both A and B is exactly the same. Sofabed. Copulative/duandua: there’s no bidirectional hyponymy relationship. In other words, “compound” is not a type of A nor a type of B. Its meaning is not compositional.
... Continue reading "Types of motor" »

"average velocity vector" speed "average speed" pdf acceleration

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Biomechanics: Application of mechanical principles in the study of living organisms. Kinematics: appearance or description of motion, linear kinetics, angular kinematics. Kinetics: Forces that cause motion, linear kinetics, angular kinetics. Statics: mechanics of objects moving at constant velocity. Dynamics: mechanics of objects in accelerated motion(changing) Qualitative: non numeric description based on observ Quantative: numeric description based on data collected

Force: A push or pull applied, Effect that one body has on another, is a vector quantity wit magnitude and direction, and point of application. Produces motion Internal force:act within the object hold together when acted by external forces. External force: Act on an object as... Continue reading ""average velocity vector" speed "average speed" pdf acceleration" »

Concept of education

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People think that nowclays teenagers spend too much time whith electronics devices. Some of them think that  it's a good thing meanwhile others think that it's a wasle of time. From my point of view, there are strong arguments on both sides.

On the one hand, I think that when you are a teenager. The  fact that we are able to hand electronic devices is an adventage. We can comunicate in a easier way, look for information,coithoud leaving our house, we can't keep ourselves entertaining and learn at the some time playing education games. Although is not also time that all for us use this with the same targer

On the oyher hand, people too young can access to innapropiate content. Also if we can't control the time we spend with electronics devices    ... Continue reading "Concept of education" »