Pratica di Shadowing: Power – Rate of Work - Impara a parlare inglese con i video

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Ever walked up a flight of stairs and wondered why running up feels so much harder?
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Think about what it takes to get up stairs.
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With every step, your muscles lift your body against gravity.
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If you ran up instead, you'd still have to lift your weight through the same height.
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That's where power comes in.
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Power tells us how quickly work is done.
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To find average power, divide the work by the time it takes.
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Work is measured in years, time in seconds, and power in watts.
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So, if you see a power rating of one watt, that means one gear of energy is transferred every second.
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Let's put some numbers to that.
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Imagine a climb that takes 1 ,200 years of work against gravity.
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If you take 12 seconds, your average power is 100 watts.
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What if you do that same climb in 6 seconds?
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Now you're doing 200 years of work each second.
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Half the time, twice the power.
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Imagine taking a ride in a sports car.
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The driver presses the accelerator and you feel yourself pressed back into the seat as the car picks up seats.
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The car is gaining kinetic energy.
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How quickly can its engine supply energy?
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Take a 400 kilowatt engine.
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At full power, it can deliver 400 ,000 joules of mechanical energy every second.
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Now picture a standard halfback on an everyday drive.
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It can reach motorway speed, too.
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Suppose this engine is rated at 60 kW.
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At full power, that's 60 ,000 wheels every second.
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If the two cars have similar mass, they need roughly the same gain in kinetic energy to go from rest to motorway speed.
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With similar grip and losses, the more powerful car can get there seen.
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Now let's look at the world's fastest landowner, the Cheetah.
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Imagine how quickly it has to gather speed when it chases its head.
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In just a quick drive, its muscles give its body a big increase in kinetic energy.
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That's a burst of high power.
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Compare that with a hard -working husky.
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Picture it pulling a light sled along a snowy trail.
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Once the sled is gliding at a steady speed, is the husky still doing work?
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It is.
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The snow resists the sled's motion, so the husky has to keep pulling.
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Its talent is disdaining that effort over a long distance.
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Next time you head upstairs, Think about two questions.
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How much work does it take to lift you to the top?
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And how quickly do you do it?
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The first tells you about the energy changes.
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Put that together with the time taken and you have your average path.
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Thank you.

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Vocabolario e note di pronuncia per questa lezione

Questa lezione di conversazione si basa sul video “Power – Rate of Work”. Le parole che ritornano più spesso: energy, speed, quickly, husky, kinetic. Questo video contiene 43 frasi e 431 parole da ripetere con lo shadowing. Il parlato dura 3:26. Chi parla mantiene un ritmo costante di circa 126 parole al minuto, comodo per lo shadowing. Il 83% delle parole rientra nelle 3.000 più comuni dell’inglese; conviene studiare le altre prima di iniziare.

Vocaboli chiave di questo video

15 parole del video che vale la pena imparare, con pronuncia e significato:

ParolaPronunciaSignificato
watt sostantivo/wɑt/watt
muscle sostantivo/ˈmʌs.əl/muscolo
climb verbo/ˈklaɪ̯m/arrampicare, scalare
gravity sostantivo/ˈɡɹævɪti/gravità
rat sostantivo/ɹæt/topo, sorcio
stairs sostantivo/ˈstɛɹz/scala
everyday aggettivo/ˈɛvɹiˌdeɪ/quotidiano, giornaliero
gear sostantivo/ɡɪɚ/attrezzo, parafernalia
compare verbo/kəmˈpɛɚ/paragonare
trail sostantivo/tɹeɪl/strascico, traccia
chase verbo/t͡ʃeɪs/inseguire, cacciare
roughly avverbio/ˈɹʌf.li/aprprossimativamente, a grosso modo
mechanical aggettivo/məˈkænəkəl/meccanico
steady aggettivo/ˈstɪdi/fermo, saldo
gather verbo/ˈɡæðɚ/raccogliere, bottinare

I phrasal verb che sentirai

ParolaSignificato
get up verboalzarsi
pick up verbotirare su, sollevare

Pronuncia a cui fare attenzione

  • Parole lunghe — attenzione all’accento: mechanical /məˈkænəkəl/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

I suoni difficili per chi parla italiano:

  • /h/ — va soffiata, non è muta: husky /ˈhʌs.ki/, halfback /ˈhæfˌbæk/
  • Consonante finale — senza aggiungere una vocale dopo: watt /wɑt/, rat /ɹæt/, stairs /ˈstɛɹz/, chase /t͡ʃeɪs/, resist /ɹɪˈzɪst/
  • /æ/ — più aperta della “e”: gravity /ˈɡɹævɪti/, rat /ɹæt/, mechanical /məˈkænəkəl/, gather /ˈɡæðɚ/, halfback /ˈhæfˌbæk/

Come esercitarsi con questo video

  1. Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
  2. Fai shadowing frase per frase a velocità normale, ripetendo ognuna finché il tuo ritmo coincide con quello di chi parla.
  3. Registrati e confronta con l’originale, facendo attenzione a parole come watt, muscle, climb.

Cos'è la tecnica dello Shadowing?

Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.

Tecnica dello shadowing: leggi la guida completa passo dopo passo →