Chapter 1: Q 1.5. (page 5)
When you're sick with a fever and you take your temperature with a thermometer, approximately what is the relaxation time?
Short Answer
1 minute.
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Chapter 1: Q 1.5. (page 5)
When you're sick with a fever and you take your temperature with a thermometer, approximately what is the relaxation time?
1 minute.
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A frying pan is quickly heated on the stovetop It has an iron handle that is long. Estimate how much time should pass before the end of the handle is too hot to grab with your bare hand. (Hint: The cross-sectional area of the handle doesn't matter. The density of iron is aboutand its specific heat is ).
Uranium has two common isotopes, with atomic masses of 238 and 235. One way to separate these isotopes is to combine the uranium with fluorine to make uranium hexafluoride gas, UF6, then exploit the difference in the average thermal speeds of molecules containing the different isotopes. Calculate the rms speed of each type of molecule at room temperature, and compare them.
Imagine some helium in a cylinder with an initial volume of and an initial pressure of Somehow the helium is made to expand to a final volume of ,in such a way that its pressure rises in direct proportion to its volume.
(a) Sketch a graph of pressure vs. volume for this process.
(b) Calculate the work done on the gas during this process, assuming that there are no "other" types of work being done.
(c) Calculate the change in the helium's energy content during this process.
(d) Calculate the amount of heat added to or removed from the helium during this process.
(e) Describe what you might do to cause the pressure to rise as the helium expands.
The Fahrenheit temperature scale is defined so that ice melts at 320 F and water boils at 2120 F.
(a) Derive the formula for converting from Fahrenheit to Celsius and back
(b) What is absolute zero on the Fahrenheit scale?
A battery is connected in series to a resistor, which is immersed in water (to prepare a nice hot cup of tea). Would you classify the flow of energy from the battery to the resistor as "heat" or "work"? What about the flow of energy from the resistor to the water?
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