By Valentina Tobos | Laurentiu Tobos

Updated on Sep 27, 2011

Review these concepts at: Temperature and Heat Study Guide

**Practice Questions**

- A child has a viral infection and his body temperature is 101.5° F. Find the corresponding temperature in °C.
- For the information given in practice problem 1, find the corresponding Kelvin temperature.
- If the temperature-pressure drop was not linear, would scientists be able to determine the zero absolute by a linear extrapolation? Explain briefly.
- The outside temperature changes from morning to noon by about 20° F. Find the corresponding change in temperature in Celsius degrees.
- For the information given in practice problem 4, find the corresponding change in temperature in Kelvin. What do you observe about the two answers?
- Determine the relationship between Celsius scale and a made-up scale, call it FAKE, that considers 55 degrees the freezing point of water and 135 degrees the boiling point of water? Show the equation.

- Give examples of other quantities you learned about in previous lessons that represent quantities of state.
- Give examples of other quantities you learned about in previous lessons that represent quantities of process.
- An object is cooling off. Are particles slowing down or speeding up in this process? Explain briefly.
- If you raise an object from the floor, does the internal energy of the object increase, decrease, or stay the same? Explain briefly.

- A copper-based pot filled with water sits on a heating device. Explain the process of warming up the water.
- With the information given in practice problem 11, where is the water hotter? Why?

- Two objects of equal mass are exchanging heat with two heat reservoirs at the same rate. One object has a specific heat twice as large as the heat of the second object. How do the temperature variations for each object compare? Show your calculations.
- Water has a very large specific heat. Is it easy to change the temperature of a body of water: lake, sea, or ocean?
- What difference would it make in the calorimetric equation if the system is not isolated? Explain briefly.
- An iron rod receives an amount of heat of 2,380 J from a heat reservoir. The rod has a mass of 0.500 kg. Find the temperature change.
- With the information given in practice problem 16, find the initial and final temperatures if the final temperature is larger than the initial temperature.

- During the boiling process, what happens to the temperature of the liquid?
- Consider your answer to practice problem 18. Now, if you exchange more heat with the liquid, is that going to change its temperature?
- An object is placed in a steamy location, and condensation occurs on its surface. Does that change the temperature of the object? If yes, in what way?
- Ethyl alcohol has a latent heat of vaporization of 200 cal/g. Find out what quantity would be necessary to condense to create enough heat to bring to boil 200 g of water from 98°
*C*.

- Consider two aluminum rods: Rod 1 has a length three times smaller than Rod 2 but the same size diameter. How do the rods change their length if they are subjected to the same change in temperature? Show your calculations.
- For the information given in practice problem 22, how does the change in volume for the two rods compare? Show your calculations.
- When is it easier to measure thermal expansion? When the object has a large initial length? A small initial length? Or it does not matter what the initial length is?
- A silver teaspoon is placed in a hot cup of tea. The room temperature is 24.0°
*C*and the tea is at 82.0°*C*. Silver has a coefficient of thermal expansion of 1.90 ·10^{–5°}*C*^{– 1}. In the process of thermal expansion, the change in length is measured to be 165*μ*m. Find the initial and final lengths of the teaspoon.

**Answers**

- 61° C
- 311.8 K
- No, since the data cannot be fitted with a linear equation.
- 11° C
- 11 K; they are the same.
- Pressure, density, volume, etc.
- Work
- Slowing down since the object loses energy
- Stays the same since the interaction is similar
- Heat is transferred through both radiation and conduction to the pot and then transferred to the (bottom layer of) water through radiation and conduction through
*c*on to the top layers. - At the bottom closer to the heat source
- The large specific heat object heats up slower at half the rate.
- No, because the water will take a lot of heat to change its temperature slightly.
- Then energy is not conserved and you have to take losses to the surroundings into account.
- 10.6 Celsius or kelvin degrees
*t*= 6.1° C and t^{i}^{f}= 16.7° C- Stays the same
- No, all heat is used to change the state.
- It warms it up.
- 2 grams
- The longer one expands three times more than the shorter one.
- The longer one increases its volume nine times.
- It's easier for long objects.
*L*_{0}= 0.15 m and*L*_{f}= 0.15 m + 165 μm

From Physics Success in 20 Minutes A Day. Copyright © 2006 by LearningExpress, LLC. All Rights Reserved.

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