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Chapter 3: Q. 3.28 (page 73)

A person uses750kcalon a long walk. Calculate the energy used for the walk in each of the following energy units:

ajoules

bkilojoules

Short Answer

Expert verified

Part a

aThe converting energy in joules at 750kcal=3.14脳106J.

Part b

bThe converting energy into kilojoules at 750kcal=3.14脳103kJ.

Step by step solution

01

Step: 1 Given information: (Part a)

A person uses for a long walk given are:750kcal.

To calculate the amount of energy expended on a walk is converting into joules.

02

Step: 2 Converting into joules: (Part a)

Use the appropriate conversion factor to convert energy into joules.

1kcal=1000cal

1kcal=4184joule

The factor will be as,

4184joule1kcal

Changing into joules will be as,

750kcal脳4184J1kcal=3.14脳106J

As a result,750kcal=3.14脳106J.

03

Step: 3 Given information: (Part b)

A person uses for a long walk given are:750kcal.

To calculate the amount of energy expended on a walk is converting into kilojoules.

04

Step: 4 Converting into kilojoules: (Part b)  

Use the appropriate conversion factor to convert energy into kilojoules.

1kcal=1000cal

1kcal=4184joule

Changing into kilojoules will be as,

750kcal脳4184J1kcal脳1kJ103J=3.14脳103kJ

As a result,750kcal==3.14脳103kJ.

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Most popular questions from this chapter

Using the energy values for foods (see Table), determine each of the following (round off the answer for each food type to the tens place):

(a) the total kilojoules for one cup of orange juice that contains 26 g of carbohydrate, no fat, and 2gof protein

(b) the grams of carbohydrate in one apple if the apple has no fat and no protein and provides 72kcalof energy

(c) the kilocalories in one tablespoon of vegetable oil, which contains14gof fat and no carbohydrate or protein

(d )the grams of fat in one avocado that has 405kcal, 13gof carbohydrate, and 5gof protein

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bHow many kilograms of oil are needed to change 150kg of water to steam at 100鈭�C ?

For lunch, Charles consumed 3oz of skinless chicken, 3oz of broccoli, 1medium apple, and1 cup of nonfat milk (see Table 3.8). How many kilocalories did Charles obtain from the lunch?

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