An engineer is developing an electric water heater to

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

Problem 119P 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 0 299 Reviews
29
0
Problem 119P

An engineer is developing an electric water heater to provide a continuous supply of hot water. One trial design is shown in Fig. Water is flowing at the rate of 0.500 kg/min, the inlet thermometer registers 18.0°C, the voltmeter reads 120 V, and the ammeter reads 15.0 A [corresponding to a power input of (120 V) × (15.0 A) = 1800 W]. (a) When a steady state is finally reached, what is the reading of the outlet thermometer? (b) Why is it unnecessary to take into account the heat capacity ?mc? of the apparatus itself? Figure:

Step-by-Step Solution:

Solution 119P Step 1: The equation for specific heat, Q = mCT Where, m - mass of the object C - Specific heat capacity of the substance T - Change in temperature of the system Step 2: The heat energy input is through the electrical energy. Electric power, P= VI = 1800 W Total energy, Q = Pt So, we can write, VIt = mCT Or, VI = (m/t) CT Here, we are using water. So, the specific heat capacity of water, C water 4184 J/ kg K m/t is nothing but the rate of mass flow. Provided, m/t = 0.500 kg/min We know that, 1 min = 60 seconds Therefore, m/t = 0.500/60 kg/s = 0.008 kg/s

Step 3 of 4

Chapter 17, Problem 119P is Solved
Step 4 of 4

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

Unlock Textbook Solution

Enter your email below to unlock your verified solution to:

An engineer is developing an electric water heater to

×
Log in to StudySoup
Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 119p

Forgot password? Reset password here

Join StudySoup for FREE
Get Full Access to University Physics - 13 Edition - Chapter 17 - Problem 119p
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