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Solved: (a) How long can you play tennis on the 800 kJ

Chapter 7, Problem 59

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QUESTION:

Problem 59PE

(a) How long can you play tennis on the 800 kJ (about 200 kcal) of energy in a candy bar? (b) Does this seem like a long time? Discuss why exercise is necessary but may not be sufficient to cause a person to lose weight.

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QUESTION:

Problem 59PE

(a) How long can you play tennis on the 800 kJ (about 200 kcal) of energy in a candy bar? (b) Does this seem like a long time? Discuss why exercise is necessary but may not be sufficient to cause a person to lose weight.

ANSWER:

Solution 59PE :

Step 1 of 2:-

        To play tennis, the power required is, .

        So, for each second the person needs to spend .

        In a  candy bar, the time for which the person can play is,

        

        This can be converted into minutes, by dividing it by 60.

        .

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