# Notes, abstracts, papers, exams and problems of Physics

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## Magical thinking

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1. . No, he didn’t. His parents were workers/belonged to the working Class”. 2. He decided to go only to the classes that He found interesting 3. Because it changes things by making room for new things 4. [FALSE: (Your) time is limited (LINE 9)]. 5.  [TRUE: Don't be trapped by dogma, which is living with the results of other People's thinking. Don't let the noise of others' opinions drown out your own inner voice, heart and intuition (LINES 9-11)] 6. “Actually” (LINE 1) 7.  length. 8. Deposit (line 5) 9. AT 10. Jobs advised the Students. Jobs advised the students to live their own lives. 11. Our time is limited. We can do wonderful things. Even though / (al)though our time is limited, we can do wonderful things/ Our time is limited;
... Continue reading "Magical thinking" »

## Optics

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charge conservation is the principle that the total electric charge in an isolated system never changes.[1] The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved. Charge conservation, considered as a physical conservation law, implies that the change in the amount of electric charge in any volume of space is exactly equal to the amount of charge flowing into the volume minus the amount of charge flowing out of the volume. In essence, charge conservation is an accounting relationship between the amount of charge in a region and the flow of charge into and out of that region, given by a continuity equation between charge density{\displaystyle

## Propagation of sound

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sound: pessure waves produced when an object vibratesat a frequency between 20 Hz and 20000 Hz and there is a material medium that sound can travel through.

loudness: how loud or soft a sound is; loudness is related to the amount of energy that reaches our ears per unit of time.
pitch: how high or low a sound is; pitch is related to the frequency of the vibration that produces the sound.
timbre: quiality of a sound that makes it different to other sounds of the same pitch and loudness; timbre is related to the shape of the sound wave.
echo: reflection of sound from a surface that is more than 17 m away from the emitter.
reverberation: reflection of sound on a surface that is less than 17 m away from the emitter.
vibration: mechanical oscillation;
... Continue reading "Propagation of sound" »

## Curing concrete in "carbonated water"

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Shrinkage Reducing Admixture  “product or product residue may explosively Combust…” • Superplasticizer  Kills fish and ruins water – never pour down a Drain! • Colloidal Silver  “…known to cause birth defects…” • Silver Nitrate Solution  A poison, oxidizer, and corrosive!

Nitric acid + nitrobenzene = spontaneous explosion  We have separate storage for acids vs bases vs   Disposable safety gloves  One-time use  Remove and throw out when exiting lab • Neoprene gloves  For acids/bases  Wash outside fully before removing so next person Can use them safely • Lab coats  Protect skin from chemicals, broken glass, Abrasions  Protects your experiments from outside schmutz  According to Bruce
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## Edwardian literature

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MODERNISM (1920-1935) -Fragmentation as a reaction against classical patterns, conventions and tradition.It started before WWI, but it wasn't until afterwards that it developed. -Anti-historicist, rejects sequential time (non-cronological), absolute polarities and the division between past and present (simultaneity). -Elitist: a certain level of knowledge is required to understand this movement. -Cultural despair: society expected changes after WWI, but this didn’t happen and they are in chaos and despair, afraid of the unknown (repetitive and nightmarish circumstances). -Moral relativism: each person judges what is moral or not, there is not any absolute value. -It portrays the impact of technology: a mechanical movement will establish a... Continue reading "Edwardian literature" »

## Average velocity pdf

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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 pdf" »

## flipes

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Steak Tartar: 1/start to make the sauce by putting the Salt, pepper, and French mustard into the soup plate 2/Add the lemon juice 3/ Combine the ingredients withe a service fork 4/Add a little olive oil 5/Add the Egg yolk and a little more olive oil. Mix well 6/Ensure that the emulsion is Achived 7/Add the dry ingredients and mix well 8/ Add the chopped steak and Fold in the sauce using a service spoon and fork. The sauce should be evenly Distributed trhough the steak. 9/ add a little brandy and mix well 10/Transfer To a cold joint plate and shape with two forks. 11/Garnish with onion rings and Chopped parsley, Anchovy fillets may be chopped and added with the dry Ingredients, or kept whole and used to garnish de finished dish.

Fraises Romanoff:

## shot

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Written at on English with a size of 4.76 KB.

Example 2 Find parametric equations for a particle that starts at (0, 3, 0) and moves around a circle as shown
in Figure 17.1.
: Circle of radius 3 in the yz-plane, centered at origin
Solution Since the motion is in the yz-plane, we have x = 0 at all times t. Looking at the yz-plane from the
positive x-direction we see motion around a circle of radius 3 in the clockwise direction. Thus,
x = 0, y= 3cost, z = -3 sint.

Example 3 Describe in words the motion given parametrically by
x = cost, y = sint, z = t.
Solution The particles x- and y-coordinates give circular motion in the xy-plane, while the z-coordinate
increases steadily. Thus, the particle traces out a rising spiral, like a coiled spring. (See Figure 17.2.)
This curve is called a helix.

Figure 17.... Continue reading "shot" »

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## TECNOLOGIA

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(V) Voltage: energy per electron provided by the battery. Energy spent by each electron in a Receiver.

(R) Electric Resistance : opposition of a material to the flow of the electric current

(I) Electric current :number of electrons that flow through the conductor in 1 Second

 MAGNITUDE UNIT voltage V (volts) Electric current A (amps) resistance Ω (ohms) Power W(walts) energy I or KWH (joules)
 ALTERNATING CURRENT DIRECT CURRENT Generated in power plants Produced by batteries and solar calls V and I change with time (50 times in 1 Second) I and V are constant Electrons change their direction of movement Electrons move always in the same direction Consumed by lamps Consumed by TV control alarm clock calculator Mobile phone laptop computer

AC/DC

effects of... Continue reading "TECNOLOGIA" »