¿Qué tipo de transformación energética se produce en cada uno de los siguientes dispositivos? Ejemplo: altavoz: Energía eléctrica  Energía sonora
Una bombilla:
Una pila:
Un generador eléctrico:
Combustión de gas natural:
Un radiador eléctrico:
Una batidora:
Una célula fotovoltaica:
La dinamo de una bicicleta:
La combustión de la gasolina:
Un reactor nuclear:

Ahousehold consists of a married couple and their twin five-year old daughters. the couples children had no income and lived with their parents all of last year. how many exemptions can the couple claim on last years tax return or they file with the “ married filing jointly “ status? a. 4 b. 5 c. 3 d. 2

The idea that, for each pair of devices v and w, there’s a strict dichotomy between being “in range” or “out of range” is a simplified abstraction. more accurately, there’s a power decay function f (·) that specifies, for a pair of devices at distance δ, the signal strength f(δ) that they’ll be able to achieve on their wireless connection. (we’ll assume that f (δ) decreases with increasing δ.) we might want to build this into our notion of back-up sets as follows: among the k devices in the back-up set of v, there should be at least one that can be reached with very high signal strength, at least one other that can be reached with moderately high signal strength, and so forth. more concretely, we have values p1 ≥ p2 ≥ . . ≥ pk, so that if the back-up set for v consists of devices at distances d1≤d2≤≤dk,thenweshouldhavef(dj)≥pj foreachj. give an algorithm that determines whether it is possible to choose a back-up set for each device subject to this more detailed condition, still requiring that no device should appear in the back-up set of more than b other devices. again, the algorithm should output the back-up sets themselves, provided they can be found.\

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