Se usarán gases calientes de escape de un horno de combustión interna, para producir vapor saturado a 2 MPa. Los gases de escape entran al intercambiador de calor a 400 °C , con un flujo de 32 kg/min, mientras que el agua entra a 15°C. El intercambiador de calor(indirecto) no está bien aislado, y se estima que el 10 por ciento del calor cedido por los gases de escape se pierde a los alrededores. Si el flujo másico de gases de escape es 15 veces el del agua, determine a) la temperatura de los gases de escape en la salida del intercambiador de calor y b) la tasa de transferencia de calor al agua. Use las propiedades constantes del calor específico del aire para los gases de escape.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.