2. Un calentador de agua eléctrico opera automáticamente durante 2.0 horas diarias, a) Si el costo de la electricidad es de $ 1.20 por kWh, ¿cuál es el costo de operación del calentador durante 30
dias? b) ¿Cuál es la resistencia efectiva de un calentador de agua tipico? (Potencia = 4500 Watts,
Intensidad de corriente = 40 Amperes (A).
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Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

He latent heat of vaporization for ethyl alcohol is 854 j/g. the amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is