Questions: Complete the following table. Round each of your answers to 3 significant digits. food energy content when eaten ------------ cal kcal kJ a kiwi fruit 4.50 x 10^4 450. a corn muffin 145. three ounces of cooked sirloin steak 1.00 x 10^3

Solution Steps

To convert kilocalories (kcal) to kilojoules (kJ), use the conversion factor: \(1 \, \text{kcal} = 4.184 \, \text{kJ}\).

For a kiwi fruit: \[ 450 \, \text{kcal} \times 4.184 \, \text{kJ/kcal} = 1883.8 \, \text{kJ} \]

Rounding to 3 significant digits, we get: \[ \boxed{1.88 \times 10^{3} \, \text{kJ}} \]

To convert kilocalories (kcal) to calories (cal), use the conversion factor: \(1 \, \text{kcal} = 1000 \, \text{cal}\).

For a corn muffin: \[ 145 \, \text{kcal} \times 1000 \, \text{cal/kcal} = 145000 \, \text{cal} \]

Rounding to 3 significant digits, we get: \[ \boxed{1.45 \times 10^{5} \, \text{cal}} \]

To convert kilojoules (kJ) to kilocalories (kcal), use the conversion factor: \(1 \, \text{kJ} = 0.239006 \, \text{kcal}\).

For three ounces of cooked sirloin steak: \[ 1000 \, \text{kJ} \times 0.239006 \, \text{kcal/kJ} = 239.006 \, \text{kcal} \]

Rounding to 3 significant digits, we get: \[ \boxed{239. \, \text{kcal}} \]

Final Answer