Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 23, Problem 3PLA
To determine
Comparison of final equilibrium temperature to the initial temperature.
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A thermos contains m1 = 0.96 kg of tea at T1 = 32° C. Ice (m2 = 0.095 kg, T2 = 0° C) is added to it. The heat capacity of both water and tea is c = 4186 J/(kg⋅K), and the latent heat of fusion for water is Lf = 33.5 × 104 J/kg.
Part (a) Input an expression for the final temperature after the ice has melted and the system has reached thermal equilibrium.
Part (b) What is the final temperature in Kelvin?
Which of the following best describe “heat”?a. The total energy possessed by an object.b. The amount of energy dissipated by friction.c. The flow of temperature to or from an object.d. The total energy flowing between two objects due to temperature difference.11. How deep under the surface of a lake would the pressure be doubled than that at thesurface? (1 atm = 1.01 × 105 Pa)a. 1.00 mb. 9.80 mc. 10.3 md. 32.2 m12. An ideal fluid flows through a pipe made of two sections with diameters of 10 cm and40 cm, respectively. The speed of the fluid flow through the 40 cm section will be whatfactor times that through the 10 cm section?a. 16b. 8c. 1/8d. 1/16
What is the final temperature of a system?
Given:
The mass of the water is 80 g.
The initial temperature in the water is 20oC.
The mass of the iron is 15 g.
The initial temperature of the iron is 150oC.
Step 2
Calculation:
from the conservation of energy of the system.
the heat gained by water = heat loss by water
m1Cw(Tf−T1)=m2Ci(T2−Tf)m1CwTf-T1=m2CiT2-Tf
Here, m1 is the mass of the water,Cw is the specific heat of water, T1 is the initial temperature of the water,m2 is the mass of the iron, T2 is the initial temperature of iron, Ci is the specific heat of the iron, and Tf is the final temperature of the system.
Substitute, all known values in the above expression.
(80 g)(4.184 J/g.°C)(Tf−20°C)Tf===(15 g)(0.45 J/g.°C)(150°C-Tf)7706.9341.4722.57°C
Chapter 23 Solutions
Physics Laboratory Manual
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