Air is heated from 25°c to 140°c prior to entering a combustion furnace. the change in specific enthalpy associated with this transition is 3349 j/mol. the flow rate of air at the heater outlet is 1.65m3/min and the air pressure at this point is 122 kpa absolute. a) calculate the heat requirements in kw, assuming ideal gas behavior and that the kinetic and potential energy changes from the heater inlet to the outlet are negilible.
b) would the value of the cahnge in ke (wich was neglected in part a) be positive or negative, or would you need more info. if the latter what more info would you need.

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box