lreese
23.10.2019 •
Mathematics
Aprogram that was intended to cure a person's fear of spiders was offered at a local zoo. volunteers with a fear of spiders participated in the program, which included holding a spider for 15 minutes. one month after they completed the program, the participants were contacted and surveyed about the program. over 90 percent of the participants claimed they were cured of their fear of spiders. based on the description of the program, which of the following statements is true? (a) because over 90% of the participants claimed to be cured, the results prove that holding a spider will cure a person's fear of spiders (b) because over 90% of the participants claimed to be cured, the results can be generalized to the population of all people who have a fear of spiders. (c)because the participants were volunteers, the study is a census of all people in the local area who have a fear of spiders. confounding variable and the results can be generalized to the population of all people who have a (d)because the participants were self-selected, a person's desire to be cured could be a (e) because participants held a spider for 15 minutes, the study is an experiment fear of spiders.
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Ответ:
1) La masa del agua a temperatura ambiente es de 500 gramos, 2) La masa del agua cuando se congela es de 500 gramos, 3) La masa de agua que queda después de la evaporación es de 400 gramos, 4) Se ha evaporado 100 gramos de agua.
Explanation:
1) ¿Cuál es la masa de agua a temperatura ambiente?
Podemos determinar la masa inicial del agua (), medido en gramos, al conocer su densidad (), medida en gramos por mililitro, y volumen inicial ocupado en el vaso de precipitado (), medido en mililitros, a partir de la siguiente expresión:
Si sabemos que y , entonces:
La masa del agua a temperatura ambiente es de 500 gramos.
2) ¿Cuál es la masa de agua cuando se congela?
Puesto que el proceso de congelación no implica transferencia de masa, la masa de agua se conserva al transformarse en hielo. Por tanto, la masa resultante es de 500 gramos.
3) ¿Cuál es la masa de agua que queda después de la evaporación?
Durante la evaporación una parte del agua es transferida al aire, entonces podemos calcular la masa final (), medido en gramos, de la sustancia al multiplicar el volumen final (), medido en mililitros, por la densidad del agua (), medida en gramos por mililitro,. Es decir,
Si sabemos que y , entonces:
La masa de agua que queda después de la evaporación es de 400 gramos.
4) ¿Qué masa de agua se evaporó?
Determinamos que la masa evaporada de agua (), medida en gramos, es igual a la diferencia entre las masas inicial y final, ambas medidas en gramos:
Si y , entonces tenemos que:
Se ha evaporado 100 gramos de agua.