Un ascensor de 130 [kg] de masa levanta con velocidad constante, desde el piso hasta una altura de 20 [m], a una persona de 70 [ kg], desarrollando una potencia media de 5.000 [W]. Esta acción le tomó al ascensor A) 0,1 [s] B) 0,5 [s] C) 2,0 [s] D) 8,0 [s] E) 20,0 [s] Se les agradecería mucho que pudieran explicarme un poco el procedimiento:( gracias.
1 answer:
Answer:
D) 8.0 s.
Explanation:
(The following exercise is written in Spanish. Hence, explanations will be held in such language.)
La energía requerida para elevar el ascensor es el cambio en la energía potencial gravitacional, cuya magnitud es:
Ahora, la potencia media es el resultado anterior dividido por el tiempo. Se despeja el tiempo de la ecuación:
La opción más aproximada es D.
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