Chapter 6.1, Problem 7QR

To determine

To find: the net change in temperature over the 18 hour period.

Answer to Problem 7QR

Decreasing the temperature after the 18 hour at the rate of ${\text{3}}^{\circ }\text{C}$

Explanation of Solution

Given:

Decreasing the temperature at the rate of 1 degrees per hour for 12 hours

Rising the temperature at the rate of 1 degrees per hour for 6 hours

Calculation:

  $\begin{array}{c}\text{The net change in temp }=-1^{\circ }\text{C}/\text{hr}\times 12\text{hr}+{1.5}^{\circ }\text{C}/\text{hr}\times 6\text{hr}\\ =-{12}^{\circ }\text{C}+9^{\circ }\text{C}{\text{=-3}}^{\circ }\text{C}\end{array}$