Notes, abstracts, papers, exams and problems of Physics

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Physical Exercises

Classified in Physics

Written at February 13, 2009 on English with a size of 10.56 KB.

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

Written at September 3, 2009 on English with a size of 4.9 KB.

(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

Classified in Physics

Written at November 22, 2009 on English with a size of 22.38 KB.

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" »

Thermodynamics and Simple Harmonic Motion

Classified in Physics

Written at June 28, 2024 on English with a size of 3.38 KB.

Thermodynamics

First Law of Thermodynamics (Law of Energy Conservation)

Energy cannot be created or destroyed; it can only change forms.

Formula: ΔU=Q−W

Where: ΔU is the change in internal energy of the system, Q is the heat added to the system, W is the work done by the system.

Explanation: The total energy in a closed system remains constant. Energy can be transformed from one form to another (e.g., heat energy to mechanical energy).

Second Law of Thermodynamics

Key Concept: The total entropy (disorder) of an isolated system always increases or remains constant.

Formulas:

Entropy Change for Reversible Process: ΔS=Qrev /T

Where: ΔS is the change in entropy. Qrev is the heat added in a reversible process. T is the absolute temperature. Qirr is... Continue reading "Thermodynamics and Simple Harmonic Motion" »

Fyq

Classified in Physics

Written at June 1, 2009 on English with a size of 1.56 KB.

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.

Understanding Energy and Electricity: A Comprehensive Guide

Classified in Physics

Written at December 11, 2023 on English with a size of 2.05 KB.

By: accident, chance, hand, heart, law, mistake, no means, request, virtue of, in a good mood, private, return, time, brief, danger, difficulty, doubt, a hurry, a mess. On: purpose, a regular basis, schedule, strike, time (a tiempo), average, balance, condition, fire. At: a price, one time, risk, the age of, all cost, a glance, least. Of: member, remind, at a rate, a cause, approval, experience, get rid, habit. With: link, regret, sympathize, arguments, contact, concern, dealing, difficulty. To: explain, reply, access, addiction, belong, change, damage. For: life, once, real, a while, a reason, demand, hire. From: time to time, now on, memory, experience. Out: of place, of stock, of sight. Conductance: the amount of power - Conductivity: The... Continue reading "Understanding Energy and Electricity: A Comprehensive Guide" »

A body is placed in a certain airstream

Classified in Physics

Written at June 23, 2023 on English with a size of 1.07 KB.

FORCE:

.Any cause with the ability to: modify the state of a

body ( motion vs rest) and deform a body

1.1 Its effects produced depends on: the intensity,

the point where the force is applied and the

direction and sense

INERTIA:

.It's the property of the matter to tend to remain

on its state of motion or rest. If a body is resting, it

will continue so eternally unless a force is applied.

EQUILIBRIUM ALTERATION:

Different forces manage bodies to achieve or lose

equilibrium. Equilibrium types: stable: a slight

disturbance generates a restoring force to return to

equilibrium. Unstable: a slight disturbance leads to an

increasing departure from the equilibrium. Neutral: A

disturbance simply moves the object to a new position.

Time of useful consciousness

Classified in Physics

Written at May 17, 2023 on English with a size of 1.54 KB.

annihilate:to destroy completely

expandable:not worth keeping not essential

infinitesimallyi:in amounts so small as to be barely measurable

correlate:to figure out or create a relationship between two items or events

paradox :statement or an event that sounds impossible but seems to be true

resilient:strong but flexible able to withstand stress without injury

undulate:to move in waves or in a smooth wavelike motion

malfunctioning:not working or operating properly malfunction

stagnating:becoming foul or rotten from lack of movement stagnate

subliminal:below the level of consciousness

autor: Ray Bradbury /travis kill eckels /time safari , INC.

Unlocking Earth's Secrets: A Guide to Fossils, Geological Time, and the Origin of Life

Classified in Physics

Written at May 31, 2024 on English with a size of 2.64 KB.

What Evidence Do Rocks Provide About Life?

Rocks are still an important source of information about many forms of life that existed on this planet.

Why Can Scientists Not Be Sure How Earth Was Created?

Because no rock dates to the formation of the Earth.

How Might Fossil Teeth Reveal an Animal's Diet?

Size and shape indicate diet.

Explain Relative Dating of Fossils

Sedimentary rocks form layers, with newer or younger layers added on top of older layers. This does not tell scientists the exact age of the fossil; however, it does tell the scientist the fossil's age in relation to others above it or below it.

Two More Common Radioactive Isotopes

Potassium-40
Carbon-14

What Is a Mass Extinction?

It is when many organisms disappear from the fossil record at... Continue reading "Unlocking Earth's Secrets: A Guide to Fossils, Geological Time, and the Origin of Life" »

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

Classified in Physics

Written at April 17, 2020 on English with a size of 5.88 KB.

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" »