×
Get Full Access to University Physics - 13 Edition - Chapter 20 - Problem 49p
Get Full Access to University Physics - 13 Edition - Chapter 20 - Problem 49p

×

# CP BIO A Human Engine. You decide to use your body as a ISBN: 9780321675460 31

## Solution for problem 49P Chapter 20

University Physics | 13th Edition

• Textbook Solutions
• 2901 Step-by-step solutions solved by professors and subject experts
• Get 24/7 help from StudySoup virtual teaching assistants University Physics | 13th Edition

4 5 1 382 Reviews
20
3
Problem 49P

CP BIO A Human Engine. You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0°C) and the other end at the surface of your skin, at 30.0°C. (a) What is the maximum efficiency of such a heat engine? Would it be a very useful engine? (b) Suppose you want to use this human engine to lift a 2.50-kg box from the floor to a tabletop 1.20 m above the floor. How much must you increase the gravitational potential energy, and how much heat input is needed to accomplish this? (c) If your favorite candy bar has 350 food calories (1 food calorie = 4186 J) and 80% of the food energy goes into heat, how many of these candy bars must you eat to lift the box in this way?

Step-by-Step Solution:

Solution 49P Problem (a) Step 1: Temperature at mouth T = 37.0°C or 310K H Temperature at skin T =C0.0°C or 303K

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321675460

This full solution covers the following key subjects: engine, heat, food, box, lift. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. Since the solution to 49P from 20 chapter was answered, more than 413 students have viewed the full step-by-step answer. The answer to “CP BIO A Human Engine. You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0°C) and the other end at the surface of your skin, at 30.0°C. (a) What is the maximum efficiency of such a heat engine? Would it be a very useful engine? (b) Suppose you want to use this human engine to lift a 2.50-kg box from the floor to a tabletop 1.20 m above the floor. How much must you increase the gravitational potential energy, and how much heat input is needed to accomplish this? (c) If your favorite candy bar has 350 food calories (1 food calorie = 4186 J) and 80% of the food energy goes into heat, how many of these candy bars must you eat to lift the box in this way?” is broken down into a number of easy to follow steps, and 149 words. The full step-by-step solution to problem: 49P from chapter: 20 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. University Physics was written by and is associated to the ISBN: 9780321675460. This textbook survival guide was created for the textbook: University Physics, edition: 13.

Unlock Textbook Solution