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?
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
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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