# korean wave

Topics: Temperature, Thermodynamics, Fahrenheit Pages: 1 (324 words) Published: November 3, 2014
Nanyang Technological University
School of Physical and Mathematical Sciences
Division of Physics and Applied Physics
PH 1801 – Foundations of Physics I

Problem Set No. 6

Posted: Oct 9, 2014

---------------------------------------------------------------------------------------------------------------------------------Conceptual questions: 1. What is the difference between temperature and heat?

2. What is a thermometer and what are its working principles? 3. Metal lids on glass jars can often be loosened by running hot water over them. Why does that work?
Problems:
1. In an alcohol-in-glass thermometer, the alcohol column has length 11.82 cm at 0.0°C and length 21.85 cm at 100.0°C. What is the temperature if the column has length (a) 18.70 cm, and (b) 14.60 cm?

2. Show that if the temperature on the Celsius scale changes by ΔTC , the Fahrenheit temperature changes by ΔTF=(9/5)ΔTC.
3. The Eiffel Tower is built of wrought iron approximately 300 m tall. Estimate how much its height changes between January (average temperature of 2°C) and July (average temperature of 25°C). Ignore the angles of the iron beams and treat the tower as a vertical beam. Coefficient of linear thermal expansion of iron is

.

4. The density of gasoline at
is
.
a) What is the density on a hot day, when the temperature is ?
b) What is the percent change in density?
c) What is the percentage of gasoline spilled at
if initially we filled a steel tank full of
gasoline at
?
Coefficient of linear thermal expansion of gasoline and steel are and
, respectively.
5. A flat bimetallic strip consists of a strip of aluminium firmly glued to a strip of iron. When heated, the strip will bend. Which metal will be on the outside of the curve? Why? Optional: Assuming a perfectly circular curvature, calculate the radius of curvature of the bimetallic strip when the temperate is raised by 50 , knowing that the initial length is 10 cm and each of the metals is 2 mm thick....

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