Book edition 1st Edition

Author(s) Paul Peter Urone

Pages 1272 pages

ISBN 9781938168000

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Short Answer

(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.

(a) The duration for which you can play tennis is $30.3 m i n$ .

(b) Yes, it seems like a long time.

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Step by Step Solution

TABLE OF CONTENTS :

TABLE OF CONTENTS

Step 1: Power

Power is scalar quantity which is defined how fast the energy is being consumed by the system.

Mathematically,

$P = \frac{E}{t}$ ……………….. (1.1)

Here, E is the amount of energy consumed, and t is the time.

Step 2: The time which you can play tennis

(a)

The time can be calculated using equation (1.1).

Rearranging equation (1.1) in order to get an expression for time.

$t = \frac{E}{P}$

Here, E is the energy of the tennis player $(E = 800 kJ)$ , and P is the power consumed while playing tennis $(P = 440 W)$ .

Putting all known values,

$\begin{array}{rcl} t & = & \frac{800 kJ}{440 W} \\ = & \frac{(800 kJ) \times (\frac{1000 J}{1 kJ})}{440 W} \\ = & 1818.18 sec \times (\frac{1 min}{60 sec}) \\ = & 30.3 min \end{array}$

Therefore, the duration for which you can play tennis is $30.3 m i n$ .

Step 3: Exercise is necessary

(b)

Yes, this is surprisingly long. Exercise is required to burn more energy than is consumed.

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College Physics (Urone)

Answers without the blur.

Short Answer

(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.

Step by Step Solution

Step 1: Power

Step 2: The time which you can play tennis

Step 3: Exercise is necessary

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Select your language

College Physics (Urone)

Answers without the blur.

Short Answer

(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.

Step by Step Solution

Step 1: Power

Step 2: The time which you can play tennis

Step 3: Exercise is necessary

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(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.