an engineering student is studying specific applications of liquid nitrogen. the temperature of the material…

an engineering student is studying specific applications of liquid nitrogen. the temperature of the material in degrees celsius, y, can be modeled by the following graph, where x represents the time, in hours, since the treatment began. temperature of material which of the following statements are true for this situation? a. the materials initial temperature is -30 degrees celsius. b. the material returned to its initial temperature after 40 hours. c. the materials temperature reaches a minimum at 15 hours.

an engineering student is studying specific applications of liquid nitrogen. the temperature of the material in degrees celsius, y, can be modeled by the following graph, where x represents the time, in hours, since the treatment began. temperature of material which of the following statements are true for this situation? a. the materials initial temperature is -30 degrees celsius. b. the material returned to its initial temperature after 40 hours. c. the materials temperature reaches a minimum at 15 hours.

Answer

Explanation:

Step1: Find initial temperature

When (x = 0), from the graph, (y=0), so the initial - temperature is 0 degrees Celsius, so option A is false.

Step2: Check temperature at 40 hours

When (x = 40), (y\neq0), so the material did not return to its initial temperature after 40 hours, option B is false.

Step3: Locate minimum - point

The lowest point of the graph occurs at (x = 15) hours. At this time, the material's temperature reaches a minimum. So option C is true.

Answer:

C. The material's temperature reaches a minimum at 15 hours.