Make up to $500 this semester by taking notes for StudySoup as an Elite Notetaker Apply Now

Bicycling on a Warm Day. If the air temperature is the

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

Problem 42E Chapter 17

University Physics | 13th Edition

  • 2901 Step-by-step solutions solved by professors and subject experts
  • Get 24/7 help from StudySoup virtual teaching assistants
University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

4 5 0 341 Reviews
29
0
Problem 42E

Bicycling on ?a ?Warm Day?. If the air temperature is the same as the temperature of your skin (about 30°C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70-kg person’s body produces energy at a rate of about 500 W due to metabolism, 80% of which is converted to heat. (a) How many kilograms of water must the person’s body evaporate in an hour to get rid of this heat? The heat of vaporization of water at body temperature is 2.42 × 106 J/kg. (b) The evaporated water must, of course, be replenished, or the person will dehydrate. How many 750-mL bottles of water must the bicyclist drink per hour to replenish the lost water? (Recall that the mass of a liter of water is 1.0 kg.)

Step-by-Step Solution:

Solution to 42E Step 1 Rate of production of energy =500W Percentage of energy converted to heat =80% Amount of energy converted to heat = 500x0.8=400W Step 2 (a) 6 Heat of vaporization of water =2.42x10 J/kg Thus 2.42x10 Joules of heat is required for vaporizing 1kg of water. 6 Energy to be removed in 1h=400/3600 =1.44X10 J Therefore, Mass of water to be vaporized,M =1.44X10 J/2.42x10 J/kg 6 M=0.59kg

Step 3 of 3

Chapter 17, Problem 42E is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

The answer to “Bicycling on ?a ?Warm Day?. If the air temperature is the same as the temperature of your skin (about 30°C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70-kg person’s body produces energy at a rate of about 500 W due to metabolism, 80% of which is converted to heat. (a) How many kilograms of water must the person’s body evaporate in an hour to get rid of this heat? The heat of vaporization of water at body temperature is 2.42 × 106 J/kg. (b) The evaporated water must, of course, be replenished, or the person will dehydrate. How many 750-mL bottles of water must the bicyclist drink per hour to replenish the lost water? (Recall that the mass of a liter of water is 1.0 kg.)” is broken down into a number of easy to follow steps, and 149 words. This textbook survival guide was created for the textbook: University Physics, edition: 13. This full solution covers the following key subjects: Water, heat, body, Person, rid. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. Since the solution to 42E from 17 chapter was answered, more than 332 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 42E from chapter: 17 was answered by Patricia, our top Physics solution expert on 05/06/17, 06:07PM. University Physics was written by Patricia and is associated to the ISBN: 9780321675460.

×
Log in to StudySoup
Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 42e

Forgot password? Reset password here

Join StudySoup for FREE
Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 42e
Join with Email
Already have an account? Login here
Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or support@studysoup.com

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here