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# An engineer is developing an electric water heater to

ISBN: 9780321675460 31

## Solution for problem 119P Chapter 17

University Physics | 13th Edition

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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 of 4

Step 3 of 4

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An engineer is developing an electric water heater to