Chapter 6, Problem 6.8P

(a)

Interpretation Introduction

Interpretation: $9.0\times {10}^6\text{kJ}$ is to be converted into joules.

Concept Introduction: The SI unit of energy is joule (J). The relationship between joules and kilojoules is given below. $1{\text{kJ=10}}^3\text{J}$

(b)

Interpretation Introduction

Interpretation: $9.0\times {10}^6\text{kJ}$ is to be converted into calories.

Concept Introduction: The calorie (cal) is an older unit defined as the quantity of energy required to raise temperature of 1g of water by $1°\text{C}$ (from $14.5°\text{C}$ to $15.5°\text{C}$ ). The relationship between kilocalories and joules is given below.

  $\begin{array}{c}1{\text{kJ=10}}^3\text{J}\\ 1\text{cal=4}\text{.184}\text{J}\end{array}$

(c)

Interpretation Introduction

Interpretation: $9.0\times {10}^6\text{kJ}$ is to be converted into British thermal units.

Concept Introduction: The British thermal unit (Btu) is the quantity of energy needed to rise the temperature of 1lb of water by $1°\text{F}$ . The relationship between joules and British thermal units is given below:

  $1\text{Btu=1055}\text{J}$